Hooli
Bonafide
Okay, I've been doing a "Stop Me Before I Buy a..." series in CityBike and MD
http://www.motorcycledaily.com/2012/03/stop-me-before-i-buy-a-used-buell-xb/
http://www.motorcycledaily.com/2013/08/stop-me-before-i-buy-an-early-2000s-sportbike/
What you need to add to that list is the 2005-06 GSXR1000.
Every person I know who has sold theirs has lived to regret it. That's why my K6 stays. You can review it in the near future if you'd like. 
