Which Clutch should i get???

[supra_rulz]

so basically, i just got my '88 mk3 supra 5-speed turbo, and turns out i need to replace the clutch. it starts to slip badly in 3rd gear+. i went to my local shop who recomended SPEC as being a good brand so i took his advice and decided to buy of of their clutches and was wondering if i should get the stage 2+ or 3+. its mostly stock except a intake and boost controller. (boosting 5-6psi) i'm into drifting, and want to slowly build up this car to be perfect for that, and seeing as i have to replace it i figured i'd get something decent now so i dont have to worry about it later. any imput would be nice. thanks.

2/28/10
just to add, i'm into drifting, but i also want something that wont be unreasonably uncomfortable to drive as just a everyday car.