Clutch???
 

I'm new to the Miata World and I am curious to which clutch brand to go with mine slipping really bad!

Are you looking for a stockish one or something stronger?

Clutch
 

Stronger.

I have an ACT HDSS in my car with over twice the stock power and it holds just fine.

I have a used 1.6 version that I took out of a turbo parts car I'll sell you for $200 shipped if you cover the paypal fees. It should be able to handle about 2 to 2.5 times the stock horsepower without issue.

Clutch
 

What's the price differents for a new one

ZM1-HDSS // Advanced Clutch Technology

I've seen them from $398-$420 plus shipping with the throwout bearing, pilot bearing and alignment assist tool. I have a brand new pilot bearing but would suggest you buy a new throwout bearing since they should always be changed when you are in there.