Hard Drive
Western Digital Caviar Black WD5001AALS 500GB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive
$59.99
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G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL5D-4GBPQ - Retail
newegg.com/Product/Product.aspx?Item=N82E16820231122
$84.99
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OCZ StealthXStream OCZ700SXS 700W ATX12V / EPS12V SLI Ready CrossFire Ready Active PFC Power Supply - Retail
$74.99
You can get $25 rebate and its 10% off newegg atm.
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newegg.com/Product/Product.aspx?Item=N82E16814102848
SAPPHIRE Vapor-X 100269VXLE Radeon HD 4890 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Retail
$194.99
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I'm guessing your not buying it online so find a pc store around you and get help. I really don't know if you want AMD or Intel, ATI or Nvidia but I'd go with Nvidia if you play games with PhysX on like Mirrors Edge, PhysX just makes it more realistic.
Just write this down or remember it, ask the store guy to help. I'm sure stores don't have everything in stock.
Monitors - look for the lowest ms and highest contrast ratio, look at the specs.
GPU - Stick with 4890 or Nvidia 200 series
PSU - Ask the guy for help
Case - Buy one that looks good for you, make sure it has at least one fan on the side for the GPU.
- Buy some case fans,
ENERMAX MAGMA UC-MA12 120mm Case Fan - Retail
$15 each, buy at least 2. One for the side and the back. Their really good and quiet!
Motherboard - This can be decided and looked for once you choose if you want AMD or Intel
RAM - Theres a wide selection to choose from, I like OCZ...going over $100 for 4gb may be too much
Hard Drive - I like Seagate but Western Digital is good as well. 500gb is more then enough..32mb cache
CPU - AMD or Intel? AMD cheaper and as good
CPU stock fan isn't that good, if you plan to overclock your CPU I recommend buying CPU fan
If a pc store you live near by and has a website let us know
Canadian or American?