So you want to build a rig, with 2 options? One is 4k and another one is 2.5k? Am I correct?

Intel Core i7 6700 - RM 1318
MSI B150M Bazooka D4 - RM 399
Kingston 16GB (8GB x 2) DDR4 2133MHz Value RAM - RM 392
Zotac GTX750TI 2GB GDDR5 ZT-70605-10M - RM 509
Kingston HyperX Fury 120GB SSD - RM 209
WD Blue 1TB HDD - RM 215
FSP Hexa+ 550W - RM 188
Bitfenix Nova - RM 149
Logitech MK200 Wired Combo - RM 63
Dell S2316H - RM 657

Total: RM 4099 (ETech price inclusive of GST)

Intel Core i5 6400 - RM 779
Gigabyte H110M-DS2 (D4) - RM 289
Kingston 8GB DDR4 2133MHz Value RAM - RM 196
WD Blue 1TB HDD - RM 215
FSP Hexa+ 400W - RM 145
Bitfenix Nova - RM 149
Logitech MK200 Wired Combo - RM 63
Dell S2316H - RM 657

Total: RM 2493 (ETech price inclusive of GST)

2.5k option has iGPU which is HD 530 (almost equivalent to R7 250/GT 740), suitable for light and casual gaming.

Some rendering software will utilize the CUDA technology of Nvidia GPU if available as hardware acceleration, if you don't have any compatible GPU, the software will still work as intended, just the operation time might take longer to complete.

GTX960 is almost twice the performance of GTX750Ti, if you aren't playing graphical demanding games then GTX750Ti is enough (i.e. Dota 2/CSGO etc.).

Yep, you can.

Intel Core i7 6700 - RM 1318
MSI B150M Bazooka D4 - RM 399
Kingston 16GB (8GB x 2) DDR4 2133MHz Value RAM - RM 392
Zotac GTX970 4GB GDDR5 ZT-90101-10P - RM 1457
Kingston HyperX Fury 120GB SSD - RM 209
WD Blue 1TB HDD - RM 215
FSP Hexa+ 550W - RM 188
Bitfenix Nova - RM 149
Logitech MK200 Wired Combo - RM 63
Dell S2316H - RM 657

Total: RM 5047 (ETech price inclusive of GST)

You can overclock a locked Skylake CPU with Z170 via BCLK overclocking (provided you install the correct BIOS), but due to BCLK overclocking, it will mess up the RAM frequency also, so meaning you won't get 2666MHz (likely to be slightly lesser than actual clock speed).

Going from 2133MHz to 2666MHz is not worth, you won't notice the real life difference, you will only see improvements if you benchmark it.

I recommend you to go at least 3000MHz if you really want to have high frequency memory.

That mobo is overpriced, mATX form factor at > RM 500, you can get Gigabyte H170-HD3 at less than RM 500 and it is ATX form factor.

And as for RAM, if you are staying at the base clock of DDR4 (2133MHz), no need to spend money and get high performance RAM, just get value RAM will do, the performance difference is too tiny to notice.

And for GPU part, how much is that 4GB GTX960? The R9 380 4GB is more powerful than it and is just around RM 1000.

You should ask them why they advice you to avoid AMD card, if they cannot give a reasonable reason, then fanboy detected 

Normally I will suggest people to go for Nvidia path due to lower power consumption so they can pair with cheaper PSU (if budget is low), but since you have a decent Seasonic PSU in your buying list, so I was thinking to promote R9 380 which is more powerful than GTX960 at same price point.

And yes AMD card consumes more power and temperature is slightly higher than Nvidia card, but in 300 series, they improved a lot and closed up the gap by quite a significant margin.

Choice is yours, if you happen to play Nvidia GameWorks titles a lot or need CUDA technology, then go for GTX960 path 

Your budget can fit a GTX980Ti, which can be a little overkill for 1080p screen, but it is definitely able to max out all the games easily at such resolution for the time being.

Intel Core i7 6700 - RM 1317
Gigabyte H170-HD3 (D4) - RM 488
Corsair 16GB (8GB x 2) DDR4 2133MHz Value RAM - RM 400
Zotac GTX980Ti 6GB GDDR5 AMP - RM 2999
Kingston HyperX Fury 120GB SSD - RM 229
WD Blue 1TB HDD - RM 215
Seasonic M12II EVO 620W - RM 409
Thermaltake Versa H25 - RM 180
Dell S2316H - RM 669

Total: RM 6906 (Techview price inclusive of GST)

If you have extra funds later, upgrade to 1440p/4K or a G-Sync monitor then it would be perfect 

R9 280 is always better than GTX750Ti, even the weaker R9 270 is also faster than GTX750Ti.

If you want to buy GTX750Ti, don't look for Asus/Gigabyte, they are expensive, try looking for Zotac/Palit, especially those priced < RM 550.

PowerColor R9 270 is just RM 530.

R9 280 without a doubt but R9 280's power consumption is much higher than GTX750Ti, so please ensure the PSU can support before making purchase.

Which 500+? Not all 500W+ PSU are created equally.

So you bought i7 6700K + GTX980Ti at last? Saw your signature update 
Full load could draw nearly 270W, still ok but if you have extra money, go for something better, like Seasonic M12II EVO 620W.

i7 4790K is Haswell CPU (4th gen) so you need to get Haswell mobo, you can pair it with lower end H81/B85 without issue (some of them allow overclocking with BIOS update) and the RAM module will be the slightly slower DDR3.

i7 holds extra 4 threads (virtual cores), performance between i5 and i7 isn't big in gaming if the game isn't coded to use the extra threads of i7, but for workstation software, normally they take advantage of the extra threads.

Intel Core i7 6700 - RM 1328
Gigabyte H110M-DS2 (D4) - RM 289
Corsair 16GB (8GB x 2) DDR4 2133MHz Value RAM - RM 382
Zotac GTX750Ti 2GB GDDR5 ZT-70605-10M - RM 509
WD Blue 1TB HDD - RM 215
FSP Hexa+ 400W - RM 145
Bitfenix Nova - RM 149
BenQ GW2270 - RM 429

Total: RM 3446 (ETech price inclusive of GST)

SSD improves rendering speed? It does speed up the booting speed of the rendering software but it doesn't help in improving the time needed to finish the render, it all depends on CPU and other parts (RAM, GPU etc.).

HDD is fast enough to load the necessary elements into the rendering software during the rendering process, no point getting a large SSD but being hold back by the CPU (not fast enough to process all the data transferred into the system, end up piling up in the RAM).

i7 is a better and safer pick.