It depends on what you want to spend on a clutch, your desired power, and your intended purpose for the clutch (i.e. just daily driving, drag, autocross, etc....). Also depends on how quiet you want the clutch. The more aggressive clutch setups tend to chatter a bit, which annoys some people.

I've been fairly happy with the Exedy HD twin plate. It's kept up with my build so far and chatter really isn't that bad to me. My partner had been looking at the Tilton and Quartermaster setups for his build in the twin plates, both of which have good reputation for performance.