First, have you narrowed it down based on looks, or comort, meets your ridings needs, etc...?
Will they let you take it for a test drive? I have an older evo, so I won't be of much help with the newer models...but there should be lots of guys chiming in on this....
As far as finding out what fits what, changes, alterations, etc....good luck! If you find one please pass it on to everyone on this forum, and you might even want to pass it on to the harley dealers too...
Good luck!
Pat