To me, my Bandit is, first and formost, a sport-tourer. So, anything that might replace it would have be capable of traveling long distances in comfort and still be a hoot in the twisties. This being said, my first pick would be the DL1000 V-Strom. I like the fact that it will do everything that the Bandit does (OK, slightly less mid-range punch and the pegs scrape a little too soon) plus adds some off-road capabilities. In fact, I am seriously considering adding one to my personal fleet (I have no plans on selling the Bandit). Second choice would be an FJR1300; more power, more comfortable and shaft drive.
Other options that I would consider include the SV1000, FZ1, ZZR and more. Plus there are several other bikes that I would like to have in addition to the Bandit including the SV650 or Ninja 650 and various others.