I want the RPS triple as im hopeful it will handle some drag racing, they have carbon floater plates that wont warp, the twin has been great to me, when first installed it made a fair amount of noise and gave the odd judder, after a 1000ish miles it was almost silent and very easy to live with, looks like i have to much power for the twin now though.
If i was not doing the drag thing id be tempted to go OS Giken, i hear good stuff about them, they are reported to be very easy to use which is a good thing on a street car, our very own Chris Wilson speaks highly of them and he can rebuild them, he rebuilt Jays a while back.