Hey StormFX, that's up to you. Do you want to stay with 30-06, or switch to another caliber? I assume you want a longer barrel, do you want the same contour, or lighter, or heavier? You can also specify twist rate, depending on what weight bullet you use most, go with a slow twist for light bullets, or a faster twist for heavy bullets. For an "all purpose" rifle, it's hard to beat the 30-06 with a 1 in 10" twist, but I would want a minimum 22" or 24" barrel, my personal preference is for a 26". That all depends on how much weight you want to carry around. What range are most of your shots? For longer range shots (250 yards plus), you might be better served with a .270 Win, or .280 Rem.