I voted Seventh Son of a Seventh Son, but in hindsight I should have picked Powerslave.
I had the awesome opportunity of buying all of these albums(I think) last year. I was always a Maiden fan, but never had any of their albums. Then one glorious day I find a sale in my local video store. 2 cds for 12 euro. I dropped 72 euro on the spot. They were all Maiden albums. Ia m only missing a few I think, Iron Maiden, Virtual 9, Rock in Rio and one or too others, mostly live albums I think. The awesome thing is, all the ones I have(except the newer ones like A Matter or Life and Death) all have the picture of Eddie on the spines on the cds, so I nearly completed it in one day, that was awesome.