I'm assuming you've done some homework and may have seen the below threads. There are more. Being as different as they are, I'd try to spend time on each if at all possible and, better bring the Admiral with you. N37 used to be available for charter but I'm not sure they are available any longer.
EDIT: corrected duplicate links.
http://www.trawlerforum.com/forums/s...ory-30246.html
http://www.trawlerforum.com/forums/s...lers-1245.html
Best of luck and have fun with the one you decide on.