If its a 6 speed 02M get the CM fx850 and be done with it.
The Spec 3+ have a very nice stock feeling to it, but it will not last if you are really pushing that GTX turbo. Then you will have double work and need to buy 2 clutches instead of just buying one and be done.
Pedal feel on the FX 850 is good. I use mine as a daily and Im maxing out my 3582R with 1.06 T3 housing. Been holding up good for 2 years now.