From the good ol' days it would definitely have to be Permanent Waves ahead of Moving Pictures. Those two albums are pretty much perfect in my opinion and easily preferable to the earlier ones, imho. This represents a truly stellar peak for the band.
However......... I have a very distinct liking for Snakes and Arrows
. A recent release that seems to have garnered very little affection from the prog cognosenti, much to my surprise and dismay. I just think this is an outstanding collection of very high quality pieces and easily their best album since the aforementioned Moving Pictures. I find hardly a weak link on Snakes and Arrows (the live DVD of the same name is awesome too
). I am even tempted to vote for it seen as nobody else has. We'll see.......