I went with Where Eagles Dare, Still Life and To Tame a Land, altho I'm sure that The Trooper would've replaced Still Life if it were an option.
The one thing I don't get is all the votes for Revelations. I'm sorry, but IMO, the studio version sucks! My first Maiden album was Live After Death, and I love pretty much everything on that album, including Revelations. But later, when I got around to picking up Piece of Mind and I listened to the studio version for the first time, I was surprised how much I hated the song. I couldn't figure out why, until I relistened to the live version and saw how sssslllllllooooooooooooooowwwwwwww and plodding the studio version is. Boring! I'll never listen to the studio version, but at least the version on Live After Death breathes some life into it.