I paid $1,700 for my 200 last year. I feel I paid a little to much for all the work I put in it...lol. I would think an offer of $1,500 is in reason even if it is in as good of shape as you say. You can always go up if needed.
I'm running 13/51 also.
Mine revs great off the bottom, but I don't have a flywheel weight. Its hard to stall how it is so I didn't see the need.
I opened up the cockpit. I'm 5'9 and a half..lol...I put on IMS lower/back heavy duty pegs and have 1" bar risers with Windham pro taper. That setup feels good to me
Once you have it dialed in it will be a very competitive enduro/HS bike that is about bullet proof and reliable. When the susp. is setup for your liking (Mine is stock WP front O in back) you will be able to ride all day as long as you get yourself in condition. I like my susp. on the soft side so the bike soaks up the brunt of it. Good luck