Max props are the "Cadillac" but very pricey - be prepared to spend $3-4K before you're done. We had trouble justifying that kind of outlay.
There are other less expensive variations on the feathering prop, including the well-rated Kiwi prop at less than half the price.
Amongst folders I'd suggest you get a geared one, at least then you won't suffer the horrible vibrations in the event that only one blade 'opens' - as happens from time to time on ungeared folders.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)