Wow...boy, the OP got alot of info from this one. LOL
Back to the original question... I take the .270 over the .30-30 every time. IMO, you have nothing to lose, and everything to gain.
If you are dead set on a lever action, you might also consider a .35 or .45-70
I'd take either of those over a .30-30 as well.
Good luck
