I just never could get into Tool. Same with A Perfect Circle. Maynard is intense and has an amazing voice, but they get a bit too dirge-like for me some times. Just started getting into Muse Jan 1 this year. They are quite good.
I can run a list if anyone cares, but there are some really good old and new PR bands out there.
For you old schoolers, see an Alan Parsons show if you get a chance. Not often you get to see that level of musicianship, even if his partner has still wandered off.