That looks really nice man,
In regards to the pricing and interests, the problem is that at the moment any car that uses more than 10L/100km fuel comsumption is much more difficult to sell, and when car prices start to fall the imports are the hardest hit.
I've been looking to get a GT-T recently, the prices on these cars have fallen quite abit over the past 12 months. The problem you may have in attracting interest is that while most of your mods a quite neat, such as LED lights, tinted headlights and carbon fibre mirrors, they're cool bits and pieces but a buyer like me wouldn't really pay any extra money for them.
If I want to get a stock GT-T as a base, I could easily find one well under $20k at the moment. So you'll have to look for someone who really appreciate the looks of your car and willing to pay a bit extra for it.
That's my opinion, I really do think you have a beautiful ride there, good luck with your sale and hopefully you'll find the right buyer soon.