Eternal Idol is a classic, deserves more votes. The playing is fantastic, and Tony Martin is right up there with Dio (forget about Ozzy). The Shining is one of my all time favorite Sabbath songs.
A7X was a big album for me growing up, Mckindog is right in that, when I was in middle school, the album was very popular among rock/metal fans. It was a gateway album for a lot of people too. They opened for Maiden while supporting the album and it led a lot of people toward checking out the classics. For me it was the other way around, I was already into Maiden, but it was really exciting to see two of my favorite bands (at the time) with cross-pollinating audiences. The self titled A7X album is colorful and ambitious in a lot of ways for a band that was coming out of the mallcore scene. I don't know who picked Critical Acclaim for the representative song, but it was really the wrong choice for this audience. I would've opted for something like Brompton Cocktail or maybe even Gunslinger. I have good things to say about every track regardless.
Couldn't in good conscience vote against Zeppelin II though, which was equally important to my musical development.