First question, what are you looking for in a new clutch?
The Quad is a huge step up from a twin, I believe rated at 1,200hp.
Also, unless your using a Holinger or similar box, the Quad's going be near impossible to drive on the street. But... you won't have any problems with it at the track (except getting used to it).
I haven't personally used the OS quad, I have though driven the Exedy carbon quad (and was amazed).
What mods do you have and what goals are you looking for (ie. 1/4 mile times, huge power etc?).
All i'm saying is that maybe the Quad isn't the next step, thats all.