I have some pretty relevant info, although unfortunately it isn't good news
I bought my '06 PP Vert, similarly equipped, with magnaflow duals with a GT bumper, CAI, upper and lower billet grilles with GT fogs, and only 13k miles (automatic) for $17k from a dealership. Considering the convertible is about $5k more than the coupe when its new, and our cars are equipped almost exactly the same, have similar money spent on mods and they had virtually the same mileage...I don't think you'll be able to get $17k for it. The only semi-optimistic thing I can say about it is that the dealer was advertising my car for $20k, not 17. I had to negotiate for the 17 which took about 2 hours. But even still, I doubt I got it for any less than its worth; I probably just trimmed off some of their markup. You may get lucky and find a private buyer thats smart and realizes how hard it is to find a nice preowned v6 with the miraculous feature of being a stick shift, and may be willing to pay a little extra (even though technically the auto costs more...lol)