On air, you can probably reach between 2.3 and 2.4GHz. Keep in mind it's stock clock is 2.17GHz, but If you drop the multi and raise the fsb, the performance will be better. Since the price has dropped so much, it's not too bad of a deal currently, but just about every 1700+ DLT3C JIUHB is performing as well, and for half the price (I just bought one myself).
Yes, A7N8X is a better board than the A7V8X. Nforce2 is a much better chipset.