In my eye's there's two choices for the 15x8 TD's: 205/50/15 and 225/45/15. Moving down in tire width, when you've spent so much money for wheels seems like a loss for me.
205/50/15 is going to be the taller tire, and thus will have longer gearing than the 225's.
225/45/15 is going to be the faster size, with shorter gearing.
I'm still torn between 205/50/15 Star Specs, or 225/45/15 RS4's.