new rig help

[tsar21]

i am building a new computer.
i am probably going to use the amd 64 3800+ on the 939 socket
i dont know how much ram to use its going to be dual channel im just not sure if i need 2 gigs of dual channel or is 1 gig enough
also what video card should i use i ca spend up to 500
any suggestions for a good case

 

[sharq]

What is this computer for? Knowing what it will be used for can help us tell you what would be best.
As for the video card, is that 500 just for the video card? With 500 you can get the best video card on the market, but I would think that would just be a waste of money.