Well, I am no expert, but I'll go ahead and throw in my 2 cents... I wouldn't have a problem paying $5000.00 to $5500.00 for that bike providing you ride it and inspect it very carefully. Look for obvious (and not so obvious) signs of neglect, wear and tear. Ask about the clutch. With a 19 tooth sproket I'm a little concerned that the clutch may have taken a beating. Thats a REAL tall countersproket for that stock 790 motor. The lower Rpm's are nice but it puts alot of strain on the drivline taking off in first. I would get rid of that 19 tooth and go with either an 18 (if you do lots of highway riding), or the stock 17 tooth (if you ride mostly in town). Good luck and ride safe!
Scott