I'm a big fan of Summit. My only concern is quality parts, particularly with internal engine parts like cam shafts, lifters, bearings and rings. Imported parts concern me!
the good part about summit is that their returns are easy. also, they generally list mfg. origin in the part descriptions.
this day in age, cams & lifters are of particular concern regarding quality. depending on the direction that you're taking the build i'd be inclined to clean up and reuse what you've got or send it out and have the cam reground and the lifters refaced.