I'm surprised that know one mentioned this yet a Aprilia SXV 550, Who can't go past an insane v-twin motard, but maybe that because I ride an xb12stt
Run for your life from the SXV. I traded my Superduke for one and have regretted every second of it. The day after I got it the problems started and never ended until I sold it. Oh, and I had the newer "good" model. I should mention that it's probably the funnest bike I've ever ridden, but you need deep, deep wallets to enjoy one of these.