I came out of metal boats and went to glass this last go around. Wish I had done it sooner. A bad lower back and the activity of a metal boat just don't get along. The size of the metal boats folks are talking of would be a different animal than what I came from. i have a 17'8" glass bass boat and it is a very comfortable platform, albeit skinny in the front end compared to some. I won't get into the argument of glass vs aluminum as that has been beat on some much it's plenty tender already. A wide front end to accommodate two anglers, the live well thing isn't a big deal. I have one in the front that I use for dry storage. The few steps don't matter to me. Storage for tackle and safety gear, which has to be readily available, is more an issue to me. A four stroke would consume less fuel but weigh more. Mine has a 150 and I would put a 115 Yammy 4 stroke tomorrow if the bank could stand it. The old 3 carb outboard runs great but really likes the fuel. You've gotten some really good advice so far, and my two cents for what it's worth, and I think you're on the right track. Get as big as will fit the garage with as many ponies as you can afford, and do your homework on things like vinyl VS carpet and storage issues and things and you'll do fine. Good luck with it. Keep us posted, I for one am paying attention to what you decide and why. You teach us all.
Creativity is just intelligence fooling around