I have decided to purchase several items after a long period of searching for my perfect build, and i am not sure what power supply i will need for my build. listed below will be all my parts i will be ordering. if you have any suggestions on different parts, please tell me. this rig will be used primarily for hardcore video games.
Geforce 9800 GX2, x2
patriot 4gb 2×2gb 240 pin ddr3 sdram 1333
Western Digital 500gb 7200 rpm hard drive
intel core 2 quad q9650 95w
Creative Sound Blaster x-fi xtreme gamer 7.1 channels
EVGA nforce 790i SLI FTW ATX intel motherboard
Please suggest a cd dvd reader i seem to have lost my sticky note and i dont need a blu ray i have a ps3 for that.
Here is the rest,
Microsoft vista 64 bit english dvd for system builders
antez twelve hundred black ATX full tower case
other questions would be what can i do with that extra pci express 2.0 slot on the mother board (possibly another video card)
i have around 150$ or less to spend! (if it isnt possible for 150 or less make other suggetions)
THANKS FOR ANY AND ALL HELP!

I am thinking of buying a new computer. I plan just to use it for Internet use, and some light gaming.
I have around best buy and looked at some at a local shop here in town.
The computer tech at the local shop says that I am getting a better computer then I would get at best buy for 800 US.
This is their setup list:
AMD Athlon64 3500+ 64 S940 AM2 CPU
MSI K9NNEOF nFORCE550 AM2 Main Board
IGB 2X512MB Deal Channel DDR2 RAM
MSI GeForce6200 PCI Express Video w/
256MB TC
WD250GB SATA 8 MB 7200 RPM HARD DRIVE
16x DVD +/- RW DUAL LAYER BURNER
10/100/1000 GIGABYTE LAN
56K FAX/MODEM W/VOICE
8 CHNNEL AUDIO & LABTEC SUBWOOFER SPKRS
WIN XP HOME
Also comes with a 5 year warrenty, 1 year total warrnty, and 3 year trade in (whatever that means) plan and a custom case.
In plain, non-techial English, what does each part do? What kind of quality (and value) am I getting compared to best buy?

Changed up Graphic card, Memory, operating system and I cut out the CD drive and the Hard drive because I wasn’t quite sure on them.
Looking for 750g Hard drive
So my last build list would of been a flop, so I revised it a bit, but I’m missing some parts so I need you guys to direct me to some compatible Hard drives and a CD drive.
Memory
http://www.newegg.com/Product/Product.aspx?Item=N82E16820145197
CORSAIR DOMINATOR 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066 (PC2 8500) Dual Channel Kit Desktop Memory – Retail
Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128345
GIGABYTE GA-EP45-DS3L LGA 775 Intel P45 ATX Intel Motherboard – Retail
Graphic Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130384
EVGA 512-P3-N980-AR GeForce 9800 GT Hybrid Power 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card – Retail
Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817703009
PC Power & Cooling S75QB 750W ATX12V / EPS12V SLI NVIDIA SLI Certified (Dual 8800 GTX and below) CrossFire Ready 80 PLUS Certified Active PFC Power Supply – Retail
Processor
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115037
Intel Core 2 Duo E8400 Wolfdale 3.0GHz 6MB L2 Cache LGA 775 65W Dual-Core Processor – Retail
Operating System
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116488
Microsoft Windows Vista Home Premium SP1 64-bit English for System Builders 1pk DSP OEI DVD – OEM
Computer Case
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129021&Tpk=antex%20900
Antec Nine Hundred Black Steel ATX Mid Tower Computer Case – Retail
Shoot me some links, perferabley Newegg buys