Stick to your guns, take it to serious GM car shows. Your price is fair I think.
Find out if there is a Pontiac forum, other than the Solstice one. There are die hard Pontiac fans that know what it is and how rare it really is I think. I have no intentions of selling mine, but would require at least that amount. Yours looks babied/sheltered, there is a buyer out there that will appreciate that.