Basically my same experience too. I was going 87 in a 65. Paid the fine and i think i got the reckless driving ticket. Nothing happened to my license. I wouldn't worry about it OP, just show up with your checkbook.
Check the persons feedback. Don't just look at the grade, open it up and look closer. It's very easy to keep an A+ rating. I have seen people with numerous Fs and they still have an A+.
Don't forget about all the extra costs they added recently. Sales tax, and I think there is also a 1%...
The best way to find market prices is to check gunbroker. Search for completed listing, filter it for used, and see what has sold. Gunbroker brings top dollar, so expect a little less if you are selling on a local forum.