The Helsen looks like a good choice.
RE MOTOR I had a Jaguar/Catalina 22 and it came with a 8hp longshaft. I don't think I ever needed more than half throttle.
Anything from 4 to 8 hp will do but do get a longshaft motor. Buying used is always a bit of a ****shoot but if the owner can demonstrate it or allows you to test it and it starts easily cold AND hot and the cooling flow from the pee hole is steady then there can't be much wrong with it.
I also would not worry about age [except maybe for spares] on a used OB condition is more important. My tender sports a 23 year old Johnson which is still going strong.
Last edited by TQA; 06-17-2011 at 10:11 AM.