Depends on how much torque you're running. Most setups are fine with a single 6 paddle (no point running a 4 paddle as 6 paddle is about £30 more and gives 1/3 more life). Others for higher power choose a twin plate setup but these are quite noisy in neutral.
Last year at 300bhp/250ft/lb I ran this:
http://www.gmcmotorsport.co.uk/clutc.../prod_448.html
Now I'm running this (and to my knowledge am the only person to do so) - it requires a hydraulic conversion and a BE gearbox:
http://www.gmcmotorsport.co.uk/clutc.../prod_619.html