nice!
before you dwell into oc'ing, what psu do you have in there?
just work your ram speed down, like make it go 700 mhz, and up your fsb.
that
nv chipsetted board will be a bit more difficult to oc than a comparable intel chipsetted board,
but you should be fine for 3-3.2 on not too much voltage
dont worry about the card. get everest if youre unsure and then run furmark or such and watch the clocks go up