If money isn't an issue you may want to look at some brands above and beyond the KW V3s and R&Ts, JRZ for example. The main focus is choosing a spring rate and damper combo that suit each other for what you need. The spring rate can be "relatively" low as long as the damper and it's settings are suited for the spring.
I'll let the experts jump in here (they seem to be busy with racing in stuff right now xD) when they're free but thats just my .02 from my limited experience.
EDIT: Calum's post below reminded me of the Raceseng and Renske thread that's going on. The discussion has some awesome information in it from one of the penske Design Engineers:
http://www.ft86club.com/forums/showt...t=89839&page=3 (It's on page 3 for me, but I have the posts/page maxed out, not the default. lol Read post #81 and onwards)