Custom Computer [Need Advice]

[Paolo]

Hello, I decided that I wanted to build my own computer.

I have priced up a few things and still need information and advice on what I have chosen.
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PC CASE: Antec Nine Hundred - £68.50 - See it here. (http://www.amazon.co.uk/Antec-Nine-Hundred-Ultimate-Gamer/dp/B000JMJS7A/ref=pd_bxgy_ce_text_b)

Power Supply: Help? [Unsure what to get for this system]

Processor: Intel Core 2 Quad Q6600 - 2.40 GHz - £151.63 - See it here. (http://www.amazon.co.uk/Intel-Q6600-Core-Quad-Processor/dp/B000MM37JW/ref=sr_1_2?ie=UTF8&s=electronics&qid=1228040447&sr=8-2)

Heat Sink & CPU Fan: Help? [Unsure what to get for this system]

Motherboard: Gigabyte GA-EP45T-DS3R - £116.95 - See it here. (http://www.amazon.co.uk/Gigabyte-GA-EP45T-DS3R-Motherboard-Definition-8-channel/dp/B001C0PH5A/ref=sr_1_1?ie=UTF8&s=electronics&qid=1228041904&sr=1-1)

Memory: Corsair 3GB DDR3 XMS3 PC3-10666C9 1333MHz (3x1GB) - £114.99 - See it here. (http://www.overclockers.co.uk/search_results.php?sortby=&groupid=&search=Corsair+3GB+DDR3+XMS3+PC3-10666C9+1333MHz)

PCI-E Graphics: Sapphire ATI Radeon HD 4850 512MB (x2) - £265.56 - See it here. (http://www.amazon.co.uk/HD4850-512M-GDDR3-PCI-E-DVI-I/dp/B001BBS39W/ref=sr_1_1?ie=UTF8&s=electronics&qid=1228042266&sr=1-1)

Sound Card: Creative X-Fi Xtreme Audio 7.1 - £29.99 - See it here. (http://www.amazon.co.uk/Creative-Sound-Blaster-Xtreme-version/dp/B000RL4HE2/ref=sr_1_1?ie=UTF8&s=electronics&qid=1228042515&sr=1-1)

Primary HDD: 500GB SATA II - £37.99 - See it here. (http://www.amazon.co.uk/Generic-Hard-Disk-Drive-500GB/dp/B000OUG69K/ref=sr_1_2?ie=UTF8&s=electronics&qid=1228042639&sr=1-2)

Secondary HDD: 500GB SATA II - £37.99 - See it here. (http://www.amazon.co.uk/Generic-Hard-Disk-Drive-500GB/dp/B000OUG69K/ref=sr_1_2?ie=UTF8&s=electronics&qid=1228042639&sr=1-2)

Main Opitical Drive: 22x Dual Layer DVD +/- Rewriter - £14.94 - See it here. (http://www.overclockers.co.uk/showproduct.php?prodid=CD-087-LG)

Network Adapter: Help? [Would connecting the computer to the internet through a cable be better than a wireless network adapter?]

OS: Microsoft Windows XP Professional x64 Edition - £106.94 - See it here. (http://www.overclockers.co.uk/showproduct.php?prodid=SW-022-MS&groupid=33&catid=20&subcat=&name=Microsoft%20Windows%20XP%20Professional%20x64 %20Edition%20SP2c%20-%20OEM%20(ZAT-00124))
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As you can see a few of them are blank because I'm unsure what to get.
Could you please help me choose one.

Also could you give advice on the system.

Will it be stable?
Will I need more memory?
What kind of power supply would I require?

Thanks,
Paolo.

[Plasma]

On the network adapter... It depends on what your setup is... please explain if you have wireless internet already... and your type of connection.

[Thiefmn6092]

replace the intel cpu with an amd

also, you might run into some problems with the windows xp 64 bit edition but definately go for it, with the right software, you will see some sick performance.