Not sure if I can answer all your questions but I will tell you that I have a similar setup and everything runs perfectly together
8RDA+
2500 Barton ( stock HSF )
1GB Geil PC 3200
Antec Tower Case
ATI Radeon 9700 Pro ( built by ATI, I heard they OC better )
SyncMaster 957mb ( 19" )
Bought everything from newegg.com and have no complaints