Leadtek GTX780 RM1899
Crucial M500 RM349
Kingston 8gb ram RM229
Seasonic S12II 620W RM299
MSI Z77 G41 RM329
Total RM3105

CPU reused, the rest reserved for casing and option cpu cooler for overclocking.

If you are going to put 4 HDD in raid setup, I would suggest u get H87 or Z87 mobo that support such feature.
Else B85 will be good enough.

Both are good for 3d rendering if we are looking at multi-thread case.
http://www.anandtech.com/bench/CPU/39
There's also some cases that FX8350 performs better when the software utilize the multi-core thread from AMD cpu, but I cant remember where's the benchmark results. You can change the bench setting on link above.
By considering i7 is slightly expensive and also offer slightly better performance, lower power consumption, etc. However, we have the option of Xeon E3 1230v2/v3 that offers similar performance as i7 3770/4770 at RM100 cheaper price.

Both side are favorable depends on preference, but more likely taking the Intel path as for me im familiar to Intel more than amd.
At the meanwhile, AMD was staying AM3+ for quite some time and we didnt see much improvement on features. Instead they just add-in something like more sata/usb ports without really improve much on the mobo chipset.
Overclocking hard or easy on AMD i'm not sure, perhaps u need consult sifu from overclocking section.

Depends on your usage for further adjustment, else u will just receive some random feedbacks, downgrade/upgrade by spending more.

Its related to the crash issues recently by the game itself, just wait for the update from BF4 for further solution.

I always leave front intake as passive airflow without fans to ease my setup and cost effective. Add another two exhaust fans on top are more than enough ady imo.
Check with idealtech they recently have silverstone ap122 promo at RM29 each i think.

Yup, two exhaust at top. The rest leave blank. The rear one just leave it there temporary if budget tight and maybe upgrade/change it later if not functioning well or making noise.

Yup it is sufficient for everyday usage and task. I just built one recently for my bro too.

Yes, the onboard/integrated graphic can handle without problem.

Generally there's no exact how long a pc will last, but a pc spec will eventually outdated thats for sure.
Time estimation for a pc get outdated maybe 3-4yrs but very depending on the improvements on technology.
I upgrade my sis pc previously, a core 2 duo cpu with 4gb ddr3 ram and ssd and it is still running good.
PC slows down maybe the HDD is old and having many unnecessary/temp files, else maybe virus issues, etc.

Try

Intel i3 4130 RM399
ASROCK B85M-HDS RM249
Kingston 4gb ram RM119
Seagate 500gb HDD RM159
Sapphire 7770 RM349
FSP Hexa 500W RM149
Dell 22”S2240L IPS 21.5" monitor RM489
Any Casing RM129
Total RM2042

M4 is no longer in production i think, now Crucial produce lineup with M500 model better performance than M4.

In my opinion I dun think really need to oc to get extra bit of speed, while u may try option for an i7 processor that definitely will benefit the processing speed.
However, i5 still very capable for the usage u stated above:

Try

Intel i5 4440 RM579
ASROCK B85M-HDS RM249
Kingston 8gb ram RM229
SSD Reuse
Seagate 2TB RM274
FSP Hexa 500W RM149
Liteon DVD-RW RM59
Any Casing u like RM150
Total RM1689

However if u wants overclocking, replace the processor with "K" one and motherboard with Z87 series will do.

Actually u can just open the thread without update the first page for 2-3 months shudnt be much problem .
I can help open thread but might not be able to update time to time , coz also busy little recently.