....I'd like to autox too but that'll take some doing in this car, eh?
Buy what you like and never worry about the price. There is a pretty standard hi-low range so stick to the "average" based on upgrades.
What its worth to you is what is important. If I bought new for $134K or used for $34K its still mine and I never second guess the price because I paid what I wanted and felt was win/win to the seller as well as myself, at the time.
Here is a tip, ask 50% of asking price on every one for sale and see if someone replies back. You would be amazed...