Re: Mike Pourtnoy
I consider Kenneth Schalk from Candiria to be a master at the kind of drumming style you seem to be describing. They're very much like fusion-metal as opposed to prog-metal, so the approach is a little different, but it's very complex (the older stuff anyway). I think you can appreciate it.
I think Portnoy is a decent player, although I prefer a looser kind of style. His feel is a little too rigid for me, but it works with Dream Theater's music. Does he seem a little rushed sometimes to anyone else?