The best nForce mobo for the price is definitely the MSI K7N420-Pro. Unless you don't need a lot of PCI slots (and want a mATX nForce instead, which Abit offers), the MSI nForce board is your best bet. The best nForce board is the ASUS A7N266-E, which is currently one of the fastest and most overclockable boards on the market. However, you pay a nice hefty price.
Good luck. 🙂