It depends on if your motherboard supports SATA2 or not T.S.O.L
Adding a hard drive is easier than adding a psu.If you have the software it sets everything up for you.You just have to screw it in place and plug in the cables.
Most people would recommend a Seagate, definitely the most reliable and one with a big memory buffer is a plus
I'll let someone more knowledgeable answer the technical part but I understand in terms of speed there is very little difference Between SATA and SATA2 away .Also be aware if you get an OEM you just get the drive,no cables or software.If price isn't a big concern get retail
This is really good and a great price
http://www.ncix.com/products/index.php?sku=27144&vpn=ST3500320AS&manufacture=Seagate
If you need the space and can only fit in one drive though either the 750GB or the 1TB Seagates are the best choices,depends what you can afford.
Also I've done business with both NCiX and TigerDirect and never had any problems so just go where you can get the best deal.
That's all I can offer if you need real insight best to wait (or pm) for clocker.
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