computer suggestions

Ive never built a PC before and this is my first dedicated gaming descktop and i waslooking for some much needed advice. i want to keep it as close to $1000 but yet keep it running at very good speeds.

Budget:
[below 1500]

Expectations:
[starcraft II, BFBC2, modding, 3d modeling, movies]

Usage:
[Im hooking it up to my 47" HD led tv in my room and want to use it for gaming, modding, Bluray/dvd, and art]






Specifications:
Chassis Model: Special Deal Hot Seller - Cooler Master CM Storm Sniper

Exterior Finish: - Standard Factory Finish

Trim Accents: - Standard Factory Finish

Processor: AMD Phenom II X6 1055T Black Edition (2.8GHz) (6 Core) (6 MB Cache) AM3 Socket

Motherboard: ASUS M4A785T-M/CSM (AMD 785G Chipsets) (Socket AM3)

System Memory: 4GB DDR3 1333MHz Digital Storm Certified Performance Series (Highly Recommended) (Hand Tested)

Power Supply: 750W Digital Storm Certified (Dual SLI Compatible) (Silent Edition Recommended)

Expansion Bay: - No Thanks

Hard Drive Set 1: Operating System: 1x (500GB Western Digital (16MB Cache) (7200 RPM)

Set 1 Raid Options: - No Thanks

Hard Drive Set 2: Multimedia\Data: - No Thanks

Hard Drive Set 3: Backup\Misc.: - No Thanks

Optical Drive 1: Blu-Ray Player/DVD Player (Play Blu-Ray and Play DVDs)

Optical Drive 2: - No Thanks

Internet Access: High Speed Network Port (Supports High-Speed
Cable / DSL / Network Connections)

Video Card: !PROMOTION: 1x ATI Radeon HD 4870 X2 2GB (Powerful Dual GPU Card)

Add-on Card: - No Thanks

Sound Card: Integrated Motherboard Audio

Extreme Cooling: Standard Factory Heat-sink and Fan

H20 Tube Color:- Not Applicable, I do not have a FrostChill or Sub-Zero LCS Cooling System Selected

Chassis Airflow: Standard Factory Chassis Fans

Internal Lighting: Internal Chassis Lighting System (Blue)

Enhancements: - No Thanks

Chassis Mods: - No Thanks

Noise Reduction: - No Thanks

Boost Processor: FREE: Stage 1: Overclock the processor between 3.3GHz to 3.9GHz (Cooling Upgrade Recommended)

Boost Video Card: FREE: Yes, Overclock the video card(s) as much as possible with complete stability

Boost Memory: - No Thanks, Please do not overclock my memory

Boost OS: FREE: Yes, Disable and tweak all of the non-crucial services on the operating system

Windows OS: Microsoft Windows 7 Home Premium (64-Bit Edition)

Recovery Tools: Windows Recovery Toolkit (Bundled with Windows 7 CD)

Virus Protection: - No Thanks