Great problem to have.... What do you want a boat for? If intermediate to advanced skiing is on the list , 205 hands down. If rec skiing, wake boarding , tubing, hanging out w friends, Maristar may be better. The 205 will do everything above, just not as much storage and there is a motor in the middle. Fuel inj is nice for sure.
Why do you hate single axle trailer? Do you tow far? They are a lot more maneuverable and with maintenance will work fine.
Personally I like the looks of the prostar 10:1 over the other.