83-88 and 99-present are equally classic in my opinion. I love all eras of the band, and every album is important (whether viewed as good or bad by people, every album has had something pivotal in Maiden's history) but those 4 studio albums from 83-88 are for me the most crucial. Besides the incredible songs, sounds and performances, there is just something magical about all of them that can't be put into words. Having said all that, for me the reunion lineup is just as important. They did something bold by bringing back not just Bruce, but also Adrian and keeping Janick. Having 3 guitars has brought Maiden to a entirely greater level. And for me, Bruce's voice is just as enjoyable as it was in the 80's so often times I will rather listen to/watch live recordings from the reunion era over the classic era. As a 6 piece, they have accomplished so much. They have become more popular now then back in the 80's. They play places they never got to in the past, or rarely could thanks to the ever growing fan base and Ed Force One. They are not content to just rely on the same old songs like other bands do (some would argue that but if you compare them to other bands Maiden has a lot more varied setlists, tour themes, etc) or phone in creativity by releasing one or two ok/good albums. They have released 4 spectacular albums and The Book of Souls is sure to be another masterpiece. Recently I watched and read some interviews from 1999 where they stated their goal was essentially not just to rehash old glory but to push ahead and really make something special and it is such a nice feeling to see that they accomplished their mission. Now that Bruce is on his way to full recovery, I am sure we are all in for many special things to come in the band's future!