I haven't felt the ACT, but I've had the CM FX300 and Exedy Stage 1. The exedy is basically a stiffer version of the stock clutch. It's nearly twice the pedal pressure (but still significantly less than the FX300!) but the engagement is damn near identical to stock. It's completely dd friendly and besides the added pedal pressure, it's basically stock feeling. Here's a good thread to help decide -
http://www.ft86club.com/forums/showthread.php?t=34635
ptuning had it for $400 shipped, I'd strongly recommend that route. It didn't start slipping till over 300wtq.