I say go with the HDSS because if your goal is just to have your basic bolt ons and some mild modding then this should work out for you. The HDR4 is going is most likely going to be to much for the amount of power your going to pull from the engine, what a shame that it's cheaper. As for the stock clutches I'm still on the original one and I have 133K on the car so I know they are good but my car has had no real mods for 98% of it's life. I hope this helps.