mobos and ram
Yep. I can run the max timings, but above about 152 on FSB and nothing I try can get it to work. But then we've swapped stories about OCZ b4, you and me.
As for those 2 boards, the AK35 has more overclocking options. Higher FSB- 200 vs 166 max on the AK31 (but software could get it higher). More vcore. It has Raid (or just 2 extra ide channels if you're not into Raid), and supports ATA133. I wouldn't leave the Epox 8K3A+ out of your figuring though...
Let me also say that the extra vcore has helped me to get about 37 more MHz on my cpu than I could on the AK31... I can POST even higher, but it's not stable... still working on that. Also, my 3dmark score and Sandra benches have gone up about 3-5%.