In the end you will spend less than you would going the leader gear route and you will always have the option of going back. I wish I had a TT subframe to try out. I've driven my bros stage 3 TT and a 500whp z with 3.69 gearing quite a bit and there is a lot I really like about it.
The 4.08 gearing does make a huge difference on the butt dyno though. My stock turbo 400whp car with 4.08's felt like it pulled just as hard as a 500whp hks2530 TT geared car.