We have a 10' Avon inflatable bottom that we leave on the davits...love it. Currently with a 2 hp Honda.
Before you buy from Worst Marine, check out Inflatable Experts and Maritime Solutions, both in Annapolis...theres also a Avon dealer. Definitely get hypalon material.
Heres a link to some used boats from MS...
Maritime Solutions Inc (Annapolis, MD)
Oh yea...and forget the wood slat floor boards, you will hate it
Buying used you may have enough to buy a davit?