First time build, how's it look?

My first time building a PC - Upgrading from a 2007 2.2ghz Macbook Pro. I'm looking to see a good improvement over my MBP, gaming wise. I play WoW, Fallout 3, SCII, and D3 when they're out. Might get Red Alert 3, Bioshock, COD4.

ASUS P5Q Pro ATX Intel Motherboard
Item #:N82E16813131299

Intel Core 2 Duo E8400 3.0GHz LGA 775 65W Dual-Core Processor
Item #:N82E16819115037

Western Digital Caviar SE16 500GB 3.5" SATA 3.0Gb/s Hard Drive
Item #:N82E16822136073

CORSAIR CMPSU-750TX 750W Power Supply
Item #:N82E16817139006
(Is 750 watts excessive for a 4870 1gig - What if I may XFire them in the future?)

CORSAIR 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory
Item #:N82E16820145184

LITE-ON 20X DVD±R DVD Burner Black SATA Model iHAS120-04
Item #:N82E16827106263

ZALMAN CNPS9500 AT 2 Ball CPU Cooling Fan/Heatsink
Item #:N82E16835118003

Antec Nine Hundred Black Steel ATX Mid Tower Computer Case - Retail
Item #: N82E16811129021

SAPPHIRE Radeon HD 4870 100259-1GL Video Card
Item #:N82E16814102801
(This is the 1gig model - How does it compare to the 4850?)

Grand Total: $1457 (Tax & Shipping Incl'd - Newegg.ca)

Thanks for your help!