I have a blown Bose amp that I have not found an easy replacement of. It is a most fibre optic system I am told . Anyway, I was considering replacing the head unit with upgraded sound and technology, to an 8 " alpine unit with new alpine 5ch PDR Amp. Any thoughts on the best system out there. Ideally I want the largest screen out there that will fit in the standard Porsche opening (8") I think. I will keep all the standard kit should I ever sell ( unlikely ) Recommendations / thoughts appreciated. My car is a 2005 Turbo S .