New E8400 homebuilt system

Hello, I would like to build a new computer designed specifically for gaming. The game that I will be playing are mainly real time strategy games and maybe after a while first person shooter games, like Far Cry 2 or Crysis (not on max settings though!). Here is my build:

http://www.newegg.com/Product/Prod [...] 811129042: Antec Three Hundred Black Steel ATX Mid Tower Computer Case - Retail

http://www.newegg.com/Product/Prod [...] r%20550vx: CORSAIR CMPSU-550VX 550W ATX12V V2.2 SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7 Power Supply - Retail

http://www.newegg.com/Product/Prod [...] 827118030: Sony Optiarc Black 24X DVD+R 8X DVD+RW 12X DVD+R DL 24X DVD-R 6X DVD-RW 12X DVD-RAM 16X DVD-ROM 48X CD-R 32X CD-RW 48X CD-ROM 2MB Cache SATA DVD/CD Rewritable Drive - OEM

http://www.newegg.com/Product/Prod [...] 814150395: XFX HD-487A-ZHDC Radeon HD 4870 1GB XXX 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail

http://www.newegg.com/Product/Prod [...] 820145176: CORSAIR XMS2 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model TWIN2X4096-6400C5DHX - Retail

http://www.newegg.com/Product/Prod [...] 819115037: Intel Core 2 Duo E8400 Wolfdale 3.0GHz 6MB L2 Cache LGA 775 65W Dual-Core Processor - Retail

http://www.newegg.com/Product/Prod [...] 813131375: ASUS P5Q Turbo LGA 775 Intel P45 ATX Intel Motherboard - Retail

http://www.newegg.com/Product/Prod [...] 832116485: Microsoft Windows Vista Home Premium SP1 32-bit for System Builders - OEM

http://www.newegg.com/Product/Prod [...] 822136161: Western Digital Caviar Blue WD2500AAKS 250GB 7200 RPM 16MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive - OEM

Thank you for all of your responses!!! I would really like to know what you think of my system. I would also like to know if the power supply is big enough to support everything. Finely, I would also like to make sure that everything is compatible, and that there will be no bottlenecks. This will be my first time building a homebuilt system. Thand you!

Intels socket 775 is being discontinued . You'd be buying in the very last days. Sure there will be parts for a while but its not a great time to buy this technology

An AMD Phenom X3 720 be is a slightly better processor and coupled with an AM3 mb and DDR3 it will have a longer service life . It will also be cheaper since the processor/ram/mb will cost about $270

For a couple of dollars more you can het a samsung f3 500 gig hard drive thats much faster

Thanks for all of the info... but why woulkd not going with a newer socket be bad? would new software not work as fast with it? Or would it not allow a lot of room for upgrading?

Well, to be honest, I don't really mind much about not upgrading the cpu, because I mainly want to play current and older games. but I do care about upgrading the GPU, I know the PSU isn't big enough to support another ATI 4870, but I just wanted to know if the case and the mobo is large enough to put in another 4870?