Gamma Ray: High energy, very precise and tight, and Kai is a killer singer live (as well as lead guitarist).
Jag Panzer: Very in-your-face with lots of energy and Harry Conklin has probably the best stage presence of any frontman I have seen, not to mention killer vocals. The guitarists are also very good at interacting with the crowd. Although their studio work is great I do not feel it comes close to their live performance.
Blind Guardian: Well they are kinda boring as far as stage presence but they create a certain atmosphere with their fans that is just epic.