Wow! Am I really lucky enough to be the first one to post an album here?
Do live albums count? If so, I would have to go with Live After Death... all the classics and "Scream for me Long Beach!" to remind me of home.
If live albums don't count, then Iron Maiden's first album, which I first heard in 1985. Remember Tomorrow is still my alltime fav IM song. I wore the vinyl out of this one spinning RT, Strange World and Phantom of the Opera over and over and over and over....
UP THE IRONS!!!
Live After Death. I got that one when I was little, so it is very nostalgic for me. Studio album....either Powerslave or Number of the Beast. Those where the first three I had.