Make him a counter offer of 2300 plus fees. He knows the damage, and he is making a couple of hundred from doc fees, etc. If you buy it and like it, you will want to replace the damaged fairing. I did, so am thinking you will too. Both of my Xcitings were easy to fall in love with, and I wanted it to look good. replaced a couple of pieces, finder and fairing. Cost something like $400 total. I ride an 09 now with some custom features like seat, handlebars and stuff.
as far as buffeting at highway speeds, yes there is some with sport windscreen. It's good for looks, not so much for wind. You can replace it with the Kymco touring windscreen which sits higher. Givi makes one; some guys on the forum have that one. Living in s. Texas, i like the wind cause it gets hot here. I had the touring screen on my first Xciting, an 07. It did a good job of blocking the wind; great in winter, not so much in summer.
Enjoy the ride. A two-wheeled journey is an adventure.