To name just a few...
[ame=http://www.youtube.com/watch?v=efERFCN0B_0]Antonio Sanchez[/ame] Antonio Sanchez, drummer for the Pat Metheny Group. The guy's a freakin' monster who can do it all. Fantastic groove, chops galore, lots of nuance, and incredible with polyrhythmic stuff.
[ame=http://www.youtube.com/watch?v=J1xmRQAUOr8]Vinnie Colaiuta[/ame] I got hooked on Vinnie Colaiuta listening to the stuff he played with Frank Zappa. Give a listen to the crazy parts he nails on Joe's Garage, paying attention to all of the oddball time signatures like the 19/16 (7+7+5) parts in Packard Goose. Even if you don't dig Zappa, Vinnie's worth the listen.
[ame=http://www.youtube.com/watch?v=vTBccpkBClg]Jojo Mayer[/ame] Jojo Mayer's solo clips are impressive enough, but I really dig what he does in context, too. Some guys who play a million notes are playing almost a million notes too many. Jojo plays a ton of notes, but somehow makes them ALL fit and feel just right.
[ame=http://www.youtube.com/watch?v=tsKq3HD0EFc]Joe Morello[/ame] The playing of Joe Morello, to me, is pretty much the essence of cool. He was the groove behind Dave Brubeck classics like Take Five.
[ame=http://www.youtube.com/watch?v=GrKShqNkcnI]Papa Jo Jones[/ame] Papa Jo Jones was one of Buddy Rich's favorite drummers. That's high praise, especially considering Buddy didn't seem to have many nice words for anyone.
I love lots of the great old jazz players (and some not-so-old): Max Roach, Elvin Jones, Art Blakey, Tony Williams... man I could just keep on listing names.