What do you think of this?

CASE: Thermaltake Element-T Mid-Tower Case
PSU: Corsair Power Supplies (750 Watts CMPSU-750TX - Quad SLI Ready)
CPU: AMD Phenom™II X4 945 Quad-Core CPU w/ HyperTransport Technology
GPU: ATI Radeon HD 4850 PCI-E 16X 1GB Video Card (Major Brand Powered by ATI)

MOTHERBOARD: Asus M4A77TD PRO AM3 DDR3 AMD 770 Chipset CrossFireX Technology SATA RAID MB w/GbLAN, USB2.0, &7.1Audio
MEMORY: 4GB (2GBx2) PC1333 DDR3 PC3 10666 Dual Channel Memory (Corsair or Major Brand)
HARD DRIVE: Single Hard Drive (1TB (1TBx1) SATA-II 3.0Gb/s 16MB Cache 7200RPM HDD)
Optical Drive: LG 22X DVD±R/±RW + CD-R/RW Dual Layer Drive
Optical Drive 2: 16X DVD ROM
SOUND: HIGH DEFINITION ON-BOARD 7.1 AUDIO

NETWORK: Onboard Gigabit LAN Network
Wireless 802.11B/G Network Card: PCI Wireless 802.11g 54Mbps Network Interface Card
IEEE CARD: NONE

OS: Microsoft® Windows Vista™ Home Premium w/ Service Pack 1 (64-bit Edition)
(Free Upgrade coupon with purchasing of Vista Home Premium) Microsoft® Windows® 7 Home Premium (64-bit Edition)
Plus I'm gonna get some extra fans / cooling somewhere

I need help on some of the parts mostly advice on the MoBo and CPU, are the ones I chose decent ones that'll last me a few years? what MoBo is that efficent but not expensive?

ya i was looking at cyberpowerpc and puget and mwave and hp's site to copy paste stuff since i have them open(they all seem a tad overpriced), I'm hesistant to building it myself so i was going to still buy all the parts and then have my friend build it for me since i broke my last pc trying to upgrade it.
So far I'm thinking newegg has the best deals I see, anyone else have a different favorite site?
I generally know what psu(~650-750w) and what gfx(4850 1g or 4870 1g) card i want, but the cpu and the mobo and the hard drive i still have no idea...

The most gfx intensive game I have is BF2 project reality mod. was hoping to get something that could run resident evil 5, but might be too expensive. i wanted to only spend like 800 bucks or so
i have a 19" princeton its old (4-5 years) so i dont think it'll do 1920x1200, maybe somewhere around 1500x1000 im guessing
so what changes should i make? and where should i start w/ harddrive and cpu?

http://www.newegg.com/Product/Comb [...] mbo.245591 Combo Discount: -$15.00 Combo Price: $99.94
Antec Three Hundred Black Steel ATX Mid Tower Computer Case - Retail
Antec Basiq BP500U 500W Continuous Power ATX12V Version 2.01 Active PFC Power Supply - Retail

http://www.newegg.com/Product/Comb [...] mbo.246589 Combo Discount: -$15.00 Combo Price: $294.98 Free Shipping*
GIGABYTE GA-P55M-UD2 LGA 1156 Intel P55 Micro ATX Intel Motherboard - Retail
Intel Core i5 750 Lynnfield 2.66GHz LGA 1156 95W Quad-Core Processor Model BX80605I5750 - Retail

http://www.newegg.com/Product/Comb [...] mbo.256305 Combo Discount: -$15.00 Combo Price: $184.98 $10.00 Mail-In Rebate Price After Mail-In Rebate(s): $174.98 Free Shipping*
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL - Retail
MSI N250GTS-2D512-OCv2 GeForce GTS 250 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card - Retail

http://www.newegg.com/Product/Prod [...] 6827151187 $27.99
SAMSUNG Black 22X DVD+R 8X DVD+RW 16X DVD-ROM 48X CD-ROM 2MB Cache SATA DVD Burner - OEM

http://www.newegg.com/Product/Comb [...] 22-152-181 Combo Discount: -$10.00 Combo Price: $149.98 Free Shipping*
SAMSUNG Spinpoint F3 HD502HJ 500GB 7200 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive - Retail
Microsoft Windows Vista Home Premium SP1 64-bit for System Builders w/ Tech Guarantee - OEM | Includes free Windows 7 upgrade coupon

Total: $757.87 | $747.87 w/mail in rebate

http://www.newegg.com/Product/Prod [...] 6835103064 $19.99
Cooler Master Intel Core i5 compatible Hyper TX3 Socket 775/1156/AMD 130W 92mm "heatpipe direct contact" CPU Cooler RR-910-HTX3-GP - Retail

It depends on your resolution, higher resolutions will benefit more from increased video RAM.