I don't know . . . a list of the 10 or 20 favorite albums from before 2000 is kind of a no-brainer, I wouldn't put anything released this millenium in my top 200 albums except SDOIT and ADTOE. I mean seriously, EVERYTHING released by EVERY great rock band in history came before 2000. 99.9% of the greatest metal albums came before 2000. You may want to re-phrase the question as "before 1990" or "before 1980". Just my opinion; probably shared by any other member over the age of 30.
While I can understand the sentiment, in YOUR opinion the only good releases after 1/1/2000 were Six Degrees and Dramatic. In MY opinion, that list leaves off a LOT of the 2000 and beyond releases that I think are awesome - Fear of a Blank Planet, Deadwing, Blackwater Park, Burning Sosobra, Alter, Ghost Reveries, Watershed, Clockwork Angels, Deloused in the Comatorium, Lateralus, With Teeth, Year Zero, Degradation Trip Volumes 1 and 2, ... I could go on and on. To me, music is not flatly defined as the year it was released. It's a fun way to spark up conversations, I'll admit that.
All I'm saying is that there are excellent albums that were released in 2000 and beyond besides DT's.