Well...AIUHB was always supposed to be one of the better steppings as far as overclocking goes. So it sounds like you got a good one!
What motherboard do you currently have? For less then $100 you could get an Epox 8RDA that is just the greatest at overclocking...you can tweak every little setting imaginable.

Quite a few ppl here have this very motherboard and I'm sure they'd offer you the same advice.