First gaming/video editing rig. Thoughts needed! :D

What store are you buying from? If you post that it will help to suggest parts, if you don't know one check the link in my signature.

PC Express in the Philippines.   (pcx.com.ph)

Well here is one way to do it.

PCPartPicker part list: http://pcpartpicker.com/p/BpIc
Price breakdown by merchant: http://pcpartpicker.com/p/BpIc/by_merchant/
Benchmarks: http://pcpartpicker.com/p/BpIc/benchmarks/

CPU: Intel Core i5-3570K 3.4GHz Quad-Core Processor ($189.99 @ Microcenter)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($32.50 @ Amazon)
Motherboard: Gigabyte GA-Z77X-D3H ATX LGA1155 Motherboard ($127.98 @ SuperBiiz)
Memory: G.Skill Ares Series 16GB (2 x 8GB) DDR3-1600 Memory ($79.98 @ Outlet PC)
Storage: Samsung 830 Series 256GB 2.5" Solid State Disk ($197.28 @ TigerDirect)
Storage: Seagate Barracuda 3TB 3.5" 7200RPM Internal Hard Drive ($137.98 @ SuperBiiz)
Video Card: PowerColor Radeon HD 7870 GHz Edition 2GB Video Card ($273.98 @ SuperBiiz)
Case: Fractal Design Define R4 w/Window (White) ATX Mid Tower Case ($99.99 @ Microcenter)
Power Supply: Corsair Enthusiast 650W 80 PLUS Bronze Certified ATX12V / EPS12V Power Supply ($69.99 @ Newegg)
Optical Drive: Asus DRW-24B1ST/BLK/B/AS DVD/CD Writer ($19.99 @ Microcenter)
Operating System: Microsoft Windows 7 Home Premium SP1 (OEM) (64-bit) ($89.98 @ Outlet PC)
Total: $1319.64
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-02-04 16:42 EST-0500)

Maybe better. Depends what you like.

Do not take this CPU! Intel i5-3570 (3.40 GHz)
Better is the intel xeon 1230V2 and MoBo gigabyte B-75Mobo.
http://pcpartpicker.com/part/intel-cpu-bx80637e31230v2
and MoBo: http://pcpartpicker.com/part/gigabyte-motherboard-gab75...

cooler: http://pcpartpicker.com/part/cooler-master-cpu-cooler-r...

OP is in the Philippines, those links won't be of much use. This is the best I could do with the site that the OP linked to:

Try this:

Case: Antec 100 - ₱2,500.00
PSU: Silverstone Strider ST600 - ₱3,900.00
Motherboard: Asrock H77M VSP - ₱3,800.00
CPU: 3.2GHz Intel Core i5-3470 - ₱8,150.00
RAM: 2 x Corsair XMS3 4gb (CMX4GX3M1A1333C9) 1x4 - ₱1,100.00 each ( ₱2,200.00 total)
HD: 750 GB Seagate Barracuda ST - ₱3,100.00
Optical Drive: Sony DVD Burner - ₱920.00
Video Card: Power Color Radeon HD 7950 - ₱14,850.00
OS: Windows 7 Home Premium - ₱4,400.00

Total: ₱ 43,820.00 (USD $1,076.89)