athlon 64 dual core

my mate wants me to spec a dual core system for him and im thinking of going for the athlon 64x2 3800 but wich mobo would you recomened for it with SLI, s939, and btw psu's will say if its be dual core compatible? and also whats the difference between ddr and ddr2? which is better atm ?

Motherboard- Epox?

RAM- Socket 939 ONLY supports DDR ram, not DDR2.

Most PSU's are compatible with Dual Core, in your condition I would reccomend a FSP BLUESTORM PSU for £55.

Thanks.

any recent 400w+ psu will be fine, corsair twin xms 2x1gb ram is nice at £150 but for £90 you can get 2x1gb corsair value select which is fine if you're not overclocking.