I think the overwhelming vote will be the Honda F4i. They are very nice all around sportbikes,Honda(of course)reliable,quick,good handling,relatively fast and light. I do not have an F4i,but a friend of mine does and I have to push my FZR pretty hard overall to stay with him,very impressive indeed. My bike looks HUGE next to that little thing!
The F4i reminds me very much of the beautiful '88 Hurricane 600 I had. Just a great do-it-all sportbike,but the F4i's power to weight is much better than what I had on tap with the Hurricane.
The later F2s and F3s somehow seemed to go in a different more hyper/radical direction and I think they lost some of the charm along the way. I think people see them as "Throw-away" starter sportbikes which may or may not be fair? I'm sure they are faster,handle better and all that jazz,but I will always have a soft spot for the tiny Hurricanes and of course the modern version the Honda F4i.