Frame choice depends ona few things.. first of all, whats your budget?? second of all, how much can you spend?
the Nashbar frame can't be beat if youre scraping change together and want a new frameset. Also check out the Surly CrossCheck - its a step above the nashbar ($420 frame + fork) is made of steel, and gets rave reviews as a do it all bike. it can fit some really fat tires too for when the goin gets muddy in the woods.. fun stuff rollin on 41's in the woods I tell ya. . .
have fun, I wish I could buy a new bike right now!!!
~Steve