Actually the AK 550 weighs in at 210 kg (462.9 lbs) dry. (edit: since originally posting this I have found many references to the weight of the AK 550 being as earlier reported, 226 kg (498 lbs) but the factory claims the lighter dry weight I had been reading about before this). The TMax comes in at 218 kg (480.6 lbs) wet.
It still comes down to if you want a new super scooter in this class (500cc +) in the USA then you really only have one choice... Kymco AK 550. If you don't mind a few years used then there are more choices in the USA... Yamaha TMax 500, Burgman 650, and the AK 550. Oh, and the Silver Wing if you can find one, but that's going back a few years.
400 cc or less scooters are available from many makes still.
A shame the BMW C650 is no more other than in used from a few years ago. The engine and tranny for those was also made by Kymco when it was a good buy but then BMW went elsewhere for the core and quality dropped way down until that scooter was dropped.