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2 gig will be ample as will dual core most games and programs cannot take advantage of 4 cores - as griff said one graphics card with dx10 capabilities such as the 8800 series
i would use a board with the intel 975 chipset the nvidia chipset is bobbins performance wise.
what will you be using 4 gig of ram for? you will also need a 64bit o/s to take advantage of that ram