I have a GN and a Ty, and I would go for the Turbo Regal.
They are cheaper, easier to mod, and less particular when it comes to tuning.
Don't get me wrong, my Ty is my favorite vehicle, but its a money pit and hard to work on, and hard to get parts for, etc, etc, etc.
TR's are cheaper than GN's and have much more of a sleeper effect.