Why do you say that? I have to disagree, if anything is to be of that nature it would be the ITR tranny by far. Much much shorter gearing than a GSR.

-Good point about the LSD: completely forgot to mention that even after stating 'traction problems'. the easiest way is to like stated prior, purchase an aftermarket LSD for a GSR tranny. It would be stupid to sacrifice longer gearing simply for an LSD which can be easily attained otherwise.

My suggestion: the ultimate setup for what you are looking to get out of the car is a GSR tranny with an aftermarket LSD.

This is supposed to be a daily driver. With an ITR tranny you are going to be constantly in high revs, hence the turbo will almost always be spooling faster than necessary, hence shortening the longetivity of your FI setup.