Psycrence for an updated, more modern take on CSIT. I'm usually fond of Apocalyptica stuff, but there's only so much cello wizardry you can listen to. It far too obvious for them to cover Maiden, and I don't think this is a great one to cover without it sounding tame and watered down.
Going for The Wrathchildren's (that was the name, wasn't it?) Alexander again. I like what a non professional band with diverse influences and styles, oceans apart, have brought to this. By comparison, Primal Fear's cover isn't terribly different to the original, and just sounds like yet another metal band playing at being Maiden for the day.