GTA fronts go on the rear of TR, no spacer needed. Put the GTA rears on the front with (if I remember correctly) 5/16" spacers.
Actually the offset looks good. Believe it or not the GTA fronts have a larger lip on them (rims are deeper) than the rears. So they will look just right switched around on your car.
Im in the same boat, waiting for some fronts to come along. I havent really been sweating it though. Havent really had any problems. Just some slight rubbing on very tight turns (not the tire but the inner edge of the rim on [I think] the a-arm).