i thought about selling my NA to buy a GTT but ive been searching and average price for them is around 19-20k.
i can get my current car turbo, running with mods & tuned etc for extra 3k or so and still comes under 19k including what i paid initially for the car.
its a better option if you dont plan to mod its t*ts off.
however if u were to go all out, then a GTT would be a better option, strong gbox & brakes etc