Advice for defensive turtler...

Just upgraded from vanilla to complete pack, what recommendations do you have for a defensive turtler who doesn't like to invade unless necessary as far as civ/map/strat. I play on Prince, negates most of my advantage without letting the ai get the better of me too fast. Vanilla I played Iroquois, France and Japan the most. Now I'm kind of liking the Shoshone. haven't tried any of the other new civs since vanilla as of yet. Could use all the help I can get as far as growth as a player.

Focus on food and science, get Archers/CB/XB to defend. Also AIs in BNW are WAY less aggressive than they were in Vanilla, so you'll have much less potential to be invaded just by upgrading to BNW.

Thus far in my play tests I agree that AI Civs seem less aggressive, but Barbs seem to be invading harder and in larger numbers. It's been pushing me to up my scouting radius around my cities a bit more to defend against their invasions.