Ferrea is the best there is, and the price isn't out of range of the others. I won't even use Kibblewhite anymore. They don't hold up, especially in an aggressive build. The more aggressive the cams, the faster the intakes cup. I have had Kibblewhites fail before burning 5 gallons of gas. Put Ferrea in the same build, with identical seat profile, and raced it 3 years, never even changing a shim. Wiseco is probably good as well. I just don't have enough experience with them to say good or bad. If Ferrea isn't available, I usually go for Wiseco or Xceldyne.