For main bearings, I have been using FM 107M bearings. They are a performance tri-metal bearing and you can still get a .001 undersize set so fitting bearings for proper clearance is still an option. I've never had a bad experience with Clevite (unlike what Earl stated in his post). I use Clevite rod bearings. On narrow rod applications I'm using cb1228P bearings, and on wide rods I use the H series. I like Durabond for the cam bearings.
I don't like Aluminum (bimetal) bearings for a performance application for a couple of reasons: They tolerate very little dirt (low embedability), they won't handle higher loads as well and they have a lower conformability than a Tri-metal bearing