On a smaller cat like that a couple quality
4 stroke outboards could be pretty nice. They make some 8hp and a little larger high thrust versions (12" prop!), that are pretty nice with power tilt etc. Having said that, a
diesel is hard to beat, especially if you need to power a big
alternator etc. I would want two diesels rather than one of the wierd mid boat setups a few sold. You could consider a TPI built
Lagoon 37 if you can go a little bigger than your 34. Great boats and dual diesels. OTOH, if you get a smaller boat and it needs engines, two new
4 stroke kickers wont cost and arm and a leg.... add a
Honda 2000i and some
solar panels and you are READY!