DNB and PoE are definitely the best, but I have a hard time picking between the two. DHIADW (Dead Heart in a Dead World) is also excellent, though not as technical as previous outings in some people's eyes (I don't play guitar, so I can neither confirm nor deny this fact, but the drums seemed to be on the same level to me). Actually, all the Nevermore CDs are great, IMO. One of the only bands I've found to be consistently excellent. Tell us what other bands you're into and we can make some recommendations.
Later.
Oh, and welcome to the board. Narrot will welcome you in a very Nevermorian way at some point.