I like the Falco as well for the number 1 vote. But there is also the Aprilia Futura. Newer and a bit more unique but harder to find parts etc etc and the price may be a bit high.
I would say a 900SS since I loved mine. BUT, I wish it had more power (@15-25 more HP).
I am going to try to get a TL for next race season since I know I would also use it for street riding.