I've mentioned this somewhere in this thread (I think) that I prefer Powerslave or even Seventh Son to the Number of the Beast. Powerslave basically has no weak tracks and is real fun to listen to.
Lately, I've managed to get my hands on a few more Uriah Heep albums. And Emerson Lake and Palmer's Brain Salad Surgery, which I'm liking quite a bit more than either Tarkus or Picture at an Exhibition. I think it has to do with less blues inflections, which makes Brain Salad Surgery sound more metallic perhaps.