I do run Morels, they are PBM branded and are cheaper non rebuildable style. They seem to be better then the higher dollar ones. I may run the isky's at some point down the road but in my mind they were called risky for to long to jump on the wagon yet. and I also usually go with what Nyes say about this sort of thing they build enough motors and have little failure and even a smaller issue with lifter failures. I had one go south this year @ norwalks ten grand nationals. started to chirp and caught it between rounds. I normally change them every winter but I did not from 09-10 so it was end of the 2nd year on them and much further then I'd ever taking them runs wise.
USA Performance seems to be the cheapest place to get them and several other parts.