Go for the larger boat. The small ones are ok, but the room and stability of a larger boat is alot nicer. Fished out of a 16' I had to run at the lake on sunday then fish out of a 21' Bullet on monday and there was a night and day diference. Just my thoughts! You are the one having to fish out of it.
I had a 20ft boat in a 19'6" garage. Had to use a shoe horn to get it in and couldnt walk around it....... but where theres a will theres a way. I agree go with the bigger boat. you will be happier in the long run. But like Wrechin said " Your the one fishing out of it".