I guess the California market can be different from the rest of the country, but I'd be surprised if you get anywhere near $6,500 for an RC with 40,000 miles on it, and the mods actually detract from the value, not add to it, just my opinion. You'd prob do better to put it back to stock, as much as you reasonably can, get hopefully $4000 to maybe $4500 for the stock bike, and sell all the goodies separately.
Example, I don't foresee anybody paying extra for an RC with a steering damper ... but sold separately, somebody will buy that sucker.
Same opinion for most or all of your aftermarket parts.
I'd even sell the wheels separately from the tires. You might get $100 (maybe $150?) for the tires sold separately, but I doubt the guy who wants the wheels will wanna pay much extra for them with tires.
Your rims, calipers, rotors, rearsets, Sato cans, steering damper, DHC undertail, seat, Speedo Healer and Gilles (and maybe tires, K&Ns and levers) all have value sold separately, that I don't think you're gonna get if sold already on the bike.
You'd probably do pretty well this way, but it will take some time and effort of course.
The way it sits, I'd guess maybe $4000, to maybe $5000 if you can find just the right guy who wants all your aftermarket parts and is willing to pay a little extra for them.
No offense intended, and Good luck with your sale, either way!