I won't recommend you to go for 4K UHD on RX 480 though, it is basically a FHD card (or 2K QHD at slightly lower FPS output than FHD).

There is a very limited FreeSync monitor in Malaysia due to high market share of Nvidia GPU in our local market segment.

BenQ ​XL2730Z, 2K QHD TN 144Hz
Samsung U28E590DS, 4K UHD TN 60Hz

If you go for Nvidia then there are many choices.

Yes, huge difference if your GPU can output 144Hz, if your GPU can only manage to output 60Hz on a 144Hz monitor then you won't see the difference.

You can experience 144Hz in desktop mode as well, so just go to any shop that has 144Hz demo monitor to feel the difference.

Curve screen is another example of 144Hz case, you will only know the difference when you have tried it personally, for me, yes it provides me a very nice experience especially gaming 

It depends on the game and settings you run, for MOBA/casual games like Dota 2, R9 290 should be able to output up to 144 FPS on 1080p at nearly maxed out settings, if it drops below 144 FPS, you can either tolerate with the FPS drops and screen tearing or tune down the graphics settings to get a consistent 144 FPS.

For triple A titles, nope, most likely you won't get 144 FPS unless you run everything on low/med.

Its best that you go to place like low yatt and see what you prefer. Some people prefer 2K 144 Hz monitor than 4K 60 Hz monitor. Some can live with 60 hz, some can't live with 60 hz. Some can see 4K, some say 2K and 4K looks the same. But the R9 290 will struggle at 2K 144 Hz or 4K 60 Hz.

FreeSync and GSync both are awesome technology, once you tried, it is hard to go back 

There is barely a GPU that can output at 144Hz at 2K QHD max settings in triple A titles now, that's why we have FreeSync/GSync, it helps to synchronize the frame rates (especially slow frame-timed frames) and store them in the module after sequencing them, the monitor will then push out the display in the correct sequence and interval so everything will look smooth even with different frame rates.

GTX1070/1080 average FPS in triple A titles hovers around 80 - 110 currently at 2K QHD resolution, it shouldn't be an issue when you have GSync monitor while 4K UHD is around 30 - 45.
Skylake RAM is still based on dual channel, so running 16GB x 2 will be slightly faster than running 8GB x 4 at two dual channel mode.

If the output is 144 FPS then it will be 144 FPS, the refresh rate of the monitor will follow exactly the output frame rate from the GPU so there is no delay/too fast case between the monitor and GPU, all thanks to variable refresh rate support from the module.

There are numerous of videos on YouTube which help to explain the technology behind GSync and FreeSync, have a watch to understand more.

Getting a FreeSync will not increase your FPS if your GPU is not able to output that much of frame rate.

So if you have a 144Hz with FreeSync and one 144Hz without FreeSync, what you will get with a FreeSync monitor is a smooth display all the way compared to the screen tearing and input lag from non-FreeSync monitor.

For example, your R9 290 is output-ing 100 FPS in a particular game, you will get the similar frame rate on both monitors regardless of FreeSync or no FreeSync, lets say after this particular frame rate (100 FPS), the FPS drops to 80 FPS, you will see screen tearing and experience input lag on non-FreeSync monitor while FreeSync monitor doesn't face this issue because the module helps to sequence the frame rate (variable) and display accordingly on the screen.

FHD, QHD, UHD all available but we have limited choice in Malaysia.

ViewSonic VX2457-mhd 24" 1080p 60Hz TN - RM 699
AOC G2460VQ6 24" 1080p 60Hz TN - RM 799
AOC G2778VQ 27" 1080p 60Hz TN - RM 989
AOC G2460PF 24" 1080p 144Hz TN - RM 1139
Samsung U28E590DS 28" 4K UHD 60Hz TN - RM 1899
BenQ XL2730Z 27" 2K QHD 144Hz TN - RM 3189
BenQ XR3501 35" 21:9 1080p 144Hz VA - RM 3999

IPS > VA > TN

IPS - expensive, slow response time (min 4ms for gaming IPS panel and can go as high as 10ms+ on non-gaming IPS panel) but great viewing angle and color quality.

VA - much cheaper than IPS, provides the 2nd best viewing angle after IPS, relatively fast response time (~2ms).

TN - cheapest among all, poor viewing angle but extremely fast response time (usually 1ms even on non-gaming TN panel), can handle high frequency easily.

Not all 21:9 is curved screen, 21:9 is ultrawide resolution, some come with curved screen some don't.

The samsung model that I posted earlier in the list is one of the cheapest 4K monitors in Malaysia.

Dell P2415Q is another one but with IPS panel and no FreeSync.
May I know your budget?

Intel build will be better due to better single threaded performance.

GTX1060 is coming soon and the estimated price of GTX1060 is around the price of GTX970, if you can wait then just wait for few more weeks.
Yes, reference model only for now though.
Value RAM = value, cheap, works on every system, for non-overclockers

Regular RAM = basically it is also counted as value RAM

Performance RAM = RAM with higher base clock, for example, the base clock of DDR4 is 2133MHz, so any RAM that has the speed beyond 2133MHz is considered as "performance RAM" and you need certain chipset (Z170 for Skylake) to take advantage of this "performance" RAM, otherwise it will be downclocked to the base clock, which makes it literally a value RAM afterall.

Dual channel (8GB x 2/4GB x 2 etc) is slightly faster than single channel (16GB x 1/8GB x 1 etc), but very hard to notice the performance difference in real life usage unless you carry out benchmark test on them.

21.5" 1080p VA panel.

Palit, Zotac, MSI, Asus, Gigabyte, EVGA etc. are GPU manufacturers while Nvidia is the GPU chipset maker, GTX is one of their consumers grade GPU series.

And yes you can ask them to ship the items/rig directly to your doorstep, in fact most of the shops in Klang Valley do provide shipping service to whole Malaysia, shipping fee may apply though.
It depends on your budget and requirements.

Need to check the lifetime left if you are buying 2nd hand SSD, most of the modern SSD come with a very long lifespan nowadays, but still recommend to check for the stats of the SSD.

If price is too close to new unit, then just get a new unit instead.

Yes, it is used to store and speed things up, but this is just the most basic/common usage of SSD.

Some people have extra requirements, such as brand, warranty, speed (benchmarking tools), form factor (2.5", M.2 etc.), controller (SATA/PCIe) etc.

You have quite a few choices with RM 350, either spend them all (max out) or get a cheap yet reliable 240GB SSD (will have some balance left) and call it a day.

Kingston SSDNow UV400 240GB, around RM 250
Intel 540S Series 240GB, around RM 360
Samsung 850 EVO 120GB, around RM 300

All are based on SATA 3 controller.