the ram that's on that list is probably just what they tested. it would take them a long time to test every type and make of module, so i'm sure what you're looking at will work.
as for looking at a new motherboard, yes, do it. the motherboard will be the backbone of your system. it can make a great videocard suck or a fast cpu unstable. look for a mobo with a lot of positive reviews. in my opinion, deciding which mobo to buy is the most important and hardest desicion to make when building a computer.
AMD Athlon 64 3200+
512 MB 2700 (Soon to be 1gb PC 3200)
ATI Radeon 9500 Pro (Soon to be ATI Radeon AIW 9800 Pro)