need help in upgrading wheels and brakes on a 1988 testarossa

I have a 1987 Testarossa with the single bolt knock off wheel. I want to upgrade my wheels and brakes, can someone tell me what is available? I have done some small research, and have only found a set of HRE wheels for my car, but would like more choices. I call Brembo, but they do not seem to know. I will go as far as changing to the 5-108 spindles/knuckles, etc. And in doing so, what exact parts will I need for the conversion? Can someone please help?