Chris:
Give Mackpipes car a try as he has an '85 Carrera and he just redid his suspension. I'm sure he'll chime in here at some point.
Having "ridden" in and driven many a modified 911 it "seems" to me that the 22 / 28 TB and HDs front, Sports rear with 22mm adj Front / Back looks to be the setup that most people are happy with for Street / track. The biggest mistake I have seen (felt) is going to stiff with the front TB and not stiff enough in the rear TB (e.g. 23+ and 27- respectivley).
Having said all that, I've only changed bushings, springplates and shocks (Koni adjustables) on my '76 Targa. Car is to soft for serious track "anything" but nice and compliant on the street. [read: wife will still ride in it and can handle the potholes, crappy Arlington roads
] Mind you, I am also running a 60 series profile tire.
Jason