The best clutch you could ever want for a nearly stock engine is the stock clutch. I've been through a number of clutchmaster clutches (about 3) and I have never been as happy as I am now with my stock clutch (But maybe it's because I'm getting old

As far as LSD goes, I have a JDM LSD and it's great. Best upgrade I ever did. Quaiffe and Kaaz are also really good. If I recall, the Kaaz is a clutch type LSD, but I'm not 100% on that. I would try and stay with a torsen type diff (nothing to replace, and if you're not rally racing, you don't need to worry about breaking it) The Quaiffe is a Torsen type, and so is the JDM LSD. You'll pay a lot for the quaiffe. The JDM tranny would probably be cheaper, but they're not too easy to come by. Good luck