I would say list a bit higher than what you really want, so you have wiggle room. Sad to see the SHO go. Also, may want to update the sig, as I think some of those mods have moved on?
I keep seriously considering getting a SHO to keep stock/basic bolt on (essentially where my PP is now) but with ACC, etc. and then race-mod the crap out of the '15.
Also, consider returning the car to stock, and selling the bolt-ons seperate. Depending on the buyer, you may get more this way.