You mentioned the game cards so I'd say go with this below.
AMD :
Board: Fatal1ty AN8-SLI
CPU: *ClawHammer *San Diego *Venice

With RAM you guys mentioned pairs, I assume you meant speed. But with dual channel you have to run 1st-sl0t 128mb with 128mb 2nd sl0t or 1st-sl0t 256mb with 256mb 2nd sl0t, etc... etc...ect... because 1st-sl0t 512mb with 128mb 2nd sl0t wont give you any.....you need same size and speed to get dual action going.