I am using a Fidanza flywheel, they are cheap and they never broke (yet). The car has a Katana blower with a 3.2 pulley and EFI stand alone. I am running quite often on track, and quite agressive too with sticky tire (Hoosier R6). No trouble at all with my idle track or street. The car is light enought to not require the weight of the stock flywheel designed for an heavy car like the Matrix.
I am running the ACT clutch HDSS. Do not use ceramic disc if you are running the car on street with many start and go on trafic, those disc have tendency to crack.