Seems like everyone's picking pretty good live bands.
Except for the guy who mentioned Dragonforce. He/she might have been joking though.
Anyway, if you're into metal/power metal at all, you should DEFINITELY check out Blind Guardian. They are personally my favorite band of all time. Check out the footage from the DVD "Imaginations Through The Looking Glass". That is an amazing concert! The song "Valhalla" in particular stands out as one of the best live performances I've seen. The audience are a big part in what makes Blind Guardian soooo good live.
Hope someone checks them out. They are truly one of the most influential artists in their genre.