CORSAIR XMS 2GB (2 x 1GB) 184-Pin DDR SDRAM DDR 400 (PC 3200) Dual Channel Kit Desktop Memory Or 2Gb DDR400 Corsair TwinX2048RE-3200(TwinX2048RE-3200) (Pair of CMX1024RE-3200)
if your mobo can run on dual channel get the double 1gb dims. or if you plan to add a lot of mem like 4gb or even more if you use single 2gb you have more free slots!
My mobo takes dual channel and they are both 2X 1 gb sticks ddr and compatible with my mobo. Which would you pick?