RE: 243 vs 30-30
Though I shoot larger calibers (270, 308, and 9.3x62), in truth, I could limit myself to my Marlin 336SS 30-30 and never be undergunned. I would bet that if most American hunter were honest with themselves that they could do the same. I have killed several deer with a 243 and MANY deer and hogs with a 30-30, and I can't see where you can go wrong either way.
If you decide on a 30-30, be sure to try the Hornady LeverEvolution ammo.