Keep the front brake kit for the 03-05 like you have and go back to the smaller stock rear brakes. If you have heat issues, you are better off getting your hands on a stock OE rear Brembo kit then anything else. With the smaller rear setup you will not likely have heat issues even with r-comps on track. If you do end up going through rear pads quickly, it will be cheaper in the long run to throw a few sets of pads at it than shipping big brake kits across the country and the car will work the best that way.