I've owned a IS111 and FU133, both 09 models. the IS111 planed earlier (wider tail) and was faster on any point of sail. FU133 felt like a pig in comparison. The late model Futuras may be different, but I think that the Futuras as they get bigger they cater more for the intermeddiate sailor.
I'd be definitely be reccommending the IS 122 given you have the smaller IS.