What are the weight differences between the ITR fly wheel over a GSR flywheel?

My clutch went out and i figured i may as well replace the flywheel while im at it. What kind of clutch would you guys recomend for my gsr? Im thinking maybe ACT stage 2, just cause of the reviews ive heard. what are the differences between street/strip, 4 puck, & 6 puck disc?
Reliabilty is a big factor too. I need something thatll last.
thx

 

TTT
Anyone?
What about jsut the weights of the flywheels?

 

2-2.5 pounds difference in weight.

Usually closer to 2 pounds though . . .

 

15lbs vs about 20

 

dont get 4-6 puck for the street, it will die real quick , a guy in my club had the 4 puck ,and it didnt last long. its made from diff material and wears quicker. if its just strip only, now thats a different story/