There are many choices for liveaboard marinas in that range, as it covers Hyannis, Buzzards Bay, Newport, Mystic, and other major sailing areas.
It would help if you gave more information, like:
do you need to be near services like grocery stores
do you need high-speed internet access
do you need to be in a major metropolitan area
what kind of boat you will be living on
what kind of draft does your boat require