The only suggestion I have is to get a 4 stroke motor if possible!!!
I agree with that ... The 16 ft Xpress I bought my dad I got the Yamaha 60 4 stroke on. Super quiet and sips gas.
If you really want to do some checking Louisiana is full of Xpress dealers and you can get a heck of a deal if you buy over there. IIRC the 4 largest Xpress dealers are in La.
When I was considering trading up last time the same boat/motor combo over there was about $2k less than one here locally.