Tonight i was driving and doing a few hard starts, nothing i thought was too hard for the car, but i noticed when i was cruising and put my foot down it would slip then take up, the more i did it the worse it got.
Is this definitely the clutch? How much does this usually cost to replace?

 

Worth watching just for the music.

 

^+1 I found that video awhile ago. Pretty good video for the music and it gives you an idea of what you need to do.

What happens is that it slips when you hit peak torque, then when the boost starts to taper and the torque lowers it catches again.