Jamie, I'm in a similar position to you mate. Under P-Plate Laws in NSW (I'm not sure where you're from?) you are restricted from driving any car with:
-Eight or more cylinders
-A turbocharged engine
-A supercharged engine
-Engine performance modifications
In my opinion the GTS is a good option for now. With 12000 get a non-turbo charged R33 or 32 and you'll be set. Personally, I love the look of the GTS. I'm actually in love with it. I say wait out a couple years before going with the GTR. It's all you're decision though. Good luck with
Seb