It's widely accepted that the video card is one of the key components for gamer machines. For example this 1G RAM dual GPU card from http://www.newegg.com/Product/Product.asp?Item=N82E16814121017 would eat 600 bucks of your budget but is almost the top end of the graphics card offerings. Yes there is a version that uses 3 of these cards but it's unsure if you want to put 1,800 bucks into the video section.
Find a nice dual core CPU with 1 or 2GB RAM and you'll be pretty close to what's best today.
Bob
Im looking to buy a PC for gaming and multimedia only, under $3,000.00 preferably. Ive been looking at Dell, Alienware, and Velocity micro. any other manufacturers that i should be looking at? any input would be very helpful

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