From experience with a 6 puck (Clutch Master FX400) on my 350z, it is a bit harsh off the line. I don't find it bad between gears at all, but once the ceramic is warmed up, it is a bit of an on/off type clutch. It has held everything I have thrown at it though.
This is the clutch I am talking about
:
Clutchmasters.com - High Performance Clutch and Flywheel Systems
In general the 6 pucks will be a bit on the harsh side (depending on the material, to a degree), and if it is in the budget, a twin disc would be optimal.
For this application (370z with any turbo) I would also make sure the clutch can hold at least 550ft/tq.