Like any vehicle kms don't bother me, but service history does. It sounds like this is a good one. Definitely unique with that color combo, AWD, and manual.
The question is, what is it worth. I think I'd be doing some looking online to see what others are listed for. I might go $1K over a similarly priced one if I like the condition and feeling of the vehicle. I'd just tell him how you came up with your number and if he doesn't agree that a decision made to me. Put the decision on him, if he accepts your offer, buy the vehicle, if he refuses the offer, move on.