General consensus is
1a. Jim Berry clutch, very good single plate clutch (about $1200 plus install I thinkl)
1b. Exedy, Australian clutch? village bike (single, twin, puck, button, whatever ) From driving my brothers car they seem to be quite heavy clutches.
1c. Nismo Super Coppermix or other Japanese aftermarket clutch ($1500+, plus install). Check Perfect Run, Nengun etc.
2. Flywheel is also a good option for ~$500, install of that should not be much more seen as the though the gearbox out is most of the work.
Whats the price on a clutch + flywheel install anyway?