$1000 Gaming Computer Build Advice

APPROXIMATE PURCHASE DATE: Next couple of days
SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming, Photoshop/InDesign, School work

PARTS NOT REQUIRED: Speakers, keyboard, monitor, mouse
PREFERRED WEBSITE(S) FOR PARTS: Newegg, Amazon

PARTS PREFERENCES: Prefer ATI graphics card to Nvidia

OVERCLOCKING: Maybe later SLI OR CROSSFIRE: Maybe Crossfire later

MONITOR RESOLUTION: 1280x1024, but may get a bigger monitor later
ADDITIONAL COMMENTS: Appearance of case does not matter. Would like the computer to be upgradeable and decent for as long as possible. Going Vista 64-bit.

Hello,
I've browsed some other builds and come up with a list. Suggestions are appreciated!
Also, can someone please confirm that I have everything I'll need to build a computer (Arctic paste, operating system install, etc...)

SAMSUNG Black 22X DVD+R 8X DVD+RW 22X DVD-R 16X DVD-ROM 48X CD-ROM 2MB Cache SATA DVD Burner LightScribe Support - OEM
http://www.newegg.com/Product/Prod [...] 6827151188

Western Digital Caviar Black WD6401AALS 640GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive - OEM
http://www.newegg.com/Product/Prod [...] 6822136319

ASUS M4A79XTD EVO AM3 AMD 790X ATX AMD Motherboard - Retail
http://www.newegg.com/Product/Prod [...] 6813131402

XFX HD-489A-ZDEC Radeon HD 4890 Xtreme 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
http://www.newegg.com/Product/Prod [...] 6814150360

Antec TruePower New TP-750 750W Continuous Power ATX12V V2.3 / EPS12V V2.91 SLI Certified CrossFire Ready 80 PLUS BRONZE Certified Active PFC "compatible with Core i7" Power Supply - Retail
http://www.newegg.com/Product/Prod [...] 6817371025

Crucial 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Dual Channel Kit Desktop Memory Model CT2KIT25664BA1339 - Retail
http://www.newegg.com/Product/Prod [...] 6820148262

AMD Phenom II X4 955 Black Edition Deneb 3.2GHz 4 x 512KB L2 Cache 6MB L3 Cache Socket AM3 125W Quad-Core Processor - Retail
http://www.newegg.com/Product/Prod [...] 6819103674
Is this overkill?

Combo: Microsoft Windows Vista Home Premium SP1 64-bit for System Builders w/ Tech Guarantee - OEM
Antec Three Hundred Illusion Black Steel ATX Mid Tower Computer Case - Retail
http://www.newegg.com/Product/Comb [...] 11-129-066

This all comes out to $940 right now.
Thank you all so much for the help!

Thank you; I saw the board said AM3/AM2+/AM2 and thought that meant it could take DDR3. Changed the original post.
I think I'd like to overdo it a little with the graphics card because I'd like to upgrade my monitor.
Anyone have other thoughts?
Thanks

Planning on ordering tonight... does everything look good?