I think the 30-30 is a fine caliber for a rifle. Mine was a Marlin
Each of the rifles you mentioned has some sort of compromise involved, but what in life doesn't? If I did not own my rifles and was shopping like you are these are the questions I would ask myself.
1) What is the
maximum range I could be engaging targets at while defending my home?
2) What is the biggest critter I might encounter and have to dispatch with this rifle?
3) How will this complement what I already have?
4) What deficiencies will this potentially leave me with?
If 1) is say 350 yards I would lean towards the .270. If the greatest distance from house is 50 yards, any of them will do just fine.
2) If there are
Big tough mean critters that might like to make a snack of you I would lean away from the bolt gun. If they get that close rate of fire from the lever gun wins in my book.
3) If I already owned a .44 handgun and bought the .44 rifle I could carry one box of ammo and feed both of them.
4) Is very subjective based solely on your perceived needs.