I personally think newegg.com is the best place to buy computer parts. Everytime I've bought something from there I've had no problems. I'm not too great with video cards so I cant help you there. As far as memory goes, I would go with Corsair (although it can be more expensive). Another good site to look at is pricewatch.com. I never buy anything from there just because I question the reliability of some of the sites...but its a good place to compare prices.
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