The nForce2 IGP is a notoriously bad overclocker. The graphics core integrated into the chipset imposes some limitations.
The new bios allows 250mhz fsb so you have a good chance of maxing out that ram. Try it out and let us know how it goes
I just ordered some Buffalo DDR466 to try and go higher with mine. Anyone need some Corsair PC3200??
As for price, I'm thinking it will go down when the new series are released like the Athlon64 version etc.