Mine too, along with Powerslave.
Dead Heart in a Dead World is great. Nevermore just are. The solo on Engines of Hate is aaaaamazing. I think its less technical over all than all there other 7 string stuff and it works really nicely. All the clean on it is great too.
Do you have Somewhere in Time? It's the missing link between PS and 7th Son and it's my favourite over those two, just by a tiny whisker...