Looks like a pretty good setup. You might want to make sure whatever ram you get, that it does decent timings. Something along the lines of 2-3-2-10 or so. Cas 2.5 should not hurt performance much.
I have a VNF3-250 showing up tomorrow along with some new OCZ PC3500EB (which is supposed to be good stuff). My A64 3000+ I already know does 2500mhz in a AN50R, so I'll see how it goes in this setup.