I like the sbt wear rings and pretty much use them exclusively. Very similar to stock ones for the 4tecs but less money. I'm an SBT dealer and can give you a decent discount, email at ohiopowersports@woh.rr.com if interested.
I have also use SBT wear rings, with no problems, I'm using a delrin wear ring in my 96GSX this will be my third season, it still looks new. Now I know where to buy SBT stuff, good deal.