Kee Marcello of Europe - I think he played only on one of their albums but that stuff is great.
I gave up on Europe when Norum left, but I remember reading an interview with Marcello where he stated something to the effect that "I play Larrivee because they are the only guitars that are deserving of my chops" or something similarly bigheaded. Never payed attention to him...
Craig Goldy - I think his playing on Dio's Magica is excellent.
I'm a big Dio fan, and an equally big Goldy fan, but I have to ask : what's the appeal of Magica?
For me it's a drab, depressing album with none of the guitar fireworks Goldy brought to Dio's live shows. I think it's my second least favourite Dio album, preceded only by the timeless stinker Angry Machines...