Yeah Live after Death is phenomenal. Great album too.

Somewhere in Time or the Stranger in a Strange Land single... Probably.   No Prayer is a great cover as well, probably their last good one. 

Just an aside, I was listening to Helstar last night, A Distant Thunder, and I'm going to posit that Winds of War from that album may be the best song Maiden never wrote.
Wearing jeans and leather, not crackerjack clothes

Had a rattle through most of the main ones there over the last couple of days. Definitely going with Powerslave as the best. I mean, realistically it's probably Number of the Beast, but it's also the most overplayed one. I liked Piece of Mind better then Seventh Son or SiT.