Personally, I'd love to see you get an 18 Square. There are workarounds for its shortcomings (or rather, oversize-comings?). And I take other crew, and with the 11' beam, that comfortably. And you can get into one pretty cheap, saving that extra cash for your ultimate F-boat solution.
But, to be honest, there in Florida is a growing fleet of I17R. At least there are several in the Panhandle. Don't know how they'll handle an extra person, but I should think for dinking around they'd do fine with the weight
sea ya
tami