Configuration Thoughts

I want a computer that can handle all the games such as Fallout 3, Starcraft 2, Diablo 3 and ports from Xbox 360/PS3 with ease (highest or near highest settings). At the same time I want it to be below $3,000 with good upgrade room. Thoughts?

Chassis: Digital Storm 850Si
Exterior Finish: - Standard Factory Finish
Interior Finish: - Standard Factory Finish
Power Supply: 750W Corsair HX (Dual SLI Compatible) (Silent Edition)
Processor: Intel Core 2 Quad Q9450 2.66GHz (1333MHz FSB) (12MB Cache)
Motherboard: Asus Rampage Formula (Chipset: Intel X48) (Supports CrossFire)
System Memory: 4GB DDR2 Corsair at 800MHz XMS2
Card Reader: - No Thanks
Hard Drive 1: 500GB Western Digital (16MB Cache) (7200 RPM) (SATA)
Hard Drive 2: - No Thanks
Raid Option: - No Thanks
Hard Drive 3: - No Thanks
Optical Drive 1: DVD-ROM/CD-ROM (DVD Reader 16x / CD Reader 40x)
Optical Drive 2: DVD±R/RW/CD-R/RW (DVD Writer 20x / CD-Writer 48x)
Wireless Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Video Card: ATI Radeon HD 4870 512MB
TV Tuner: - No Thanks
Sound Card: Integrated Motherboard Audio
Extreme Cooling: Air Cooled Stage 3 WindTunnel (Copper Heatpipe Heatsink & Additional Case Fans)
Internal Lighting: Blizzard Internal Lighting (Blue Edition) (Cold Cathode Tubes)
Modifications: - No Thanks
Boost Processor: Yes, Overclock the processor as much as possible with complete stability
Boost Video Card: - No Thanks, Please do not overclock my video card(s)
Boost Memory: - No Thanks, Please do not overclock my memory
Tweak Windows: - No Thanks, Please do not tweak the services on the operating system
Windows OS: Microsoft Windows Vista Home Premium (64-Bit Edition) (For Enthusiasts)
Restore Kit: Digital Storm Specialized Recovery System (DVD Image Based)
Protection: - No Thanks
Office: - No Thanks
Benchmarking: - No Thanks
Install/Test Game: - No Thanks
LCD Display: Acer 22 inch (Widescreen) (Black) (High-Performance Gaming Display)
Surge Shield: - No Thanks
Speakers: - No Thanks
Keyboard: Microsoft Multimedia Desktop 2.0 (Multimedia Keyboard + Optical Wheel Mouse)
Mouse: - No Thanks my keyboard comes with a mouse
External Storage: - No Thanks
Warranty: 3 Year Platinum Care Extended Parts & Labor Warranty

Also I was thinking of downgrading the cooling if it wasn't needed.

The extra headroom you'll get when overclocking with the zalman hsf is worth the extra money unless your budget is being stressed. If Assassin's Creed is any indication of how 360 to PC ports will be, the demand on the processor will be great as well as that of the ram requirements. The configuration of the rig is great right now. As tom says, you may want a different set of accesories. Keyboard and mouse selection is a personal preference thing, and unless you can go see what that model monitor looks like, you can't really tell if you'll like it. Monitor stats mean nothing, because the measurements aren't standardised.