I'd have to say EoR (remastered), that one really sticks out and I never get tired of hearing the solos!
The thing about Nevermore is that their music is different enough between albums so that I can choose something in accordance with my mood (Usually either stressed or pissed off at something). Unlike the overly publicized one hit wonders that we should all hate by now, Nevermore creates solid albums top to bottom and the music just doesn't get boring. So ask the same question in a week or a month and I might say something different.
Damn, I sound like such a fanboy... At least it's for a good reason.