What engine should I bring back?

[AzCivic]

I'm going to Japan for the next three years and I'm going to buy a car there for a daily driver but I can't bring the car back w/ out paying a crap load for shipping, but the Air Force will ship my household goods for free. So I'm thinking that right before I leave Japan I'll take the engine/tranny and any other parts I'll need out of the car and let them ship that. But what I need to know is what engine would be best for my 94 civic ex? I know the integra engines are the easiest swap but which one is best. Also how much would the labor cost to put in a Prelude engine? And can I keep AC and powersteering with it? Any advice would be greatly appreciated!