I have a Maxum 3200 SCR and I could definitely see living aboard it as a viable option it is 32' or 35' overall.... The thing you have to think about when it comes to living aboard is storage for all your stuff. .. It takes more stuff in general while living aboard then if you are just using the boat on the weekends. ... plus you always seem to collect more stuff as you go, if you keep the hoarding to a minimum a 30 to 35 would be doable! My 3200 had a huge aft cabin that could second as a nice size closet/storage area. The other thing you have to consider is the cost of dockage and other costs associated with keeping a boat in year round.
Good luck.... Keep us posted, as this is also something I am considering doing sometime in the future, possibly when I retire.