Well, unlike the people above me, I shall be not an ass and answer your question.
Now, I speak from car prices down in the Southeast, so they might vary some.
4-door GTP in good shape runs 2500-3500 around here... The gold edition doesn't really do much for value, even more so since the pinstripe is gone, badges are gone, and the rims aren't the same goldish they were.
Add in the mods you have (only you know what you paid for them) and cut that in half, then add that to the price of cars local to you.
I'd say in the 5000-6000 range
Post it on CL for even more and try to get more out of it from someone.
