Hope this hasn't been done before but knew we'd had a best guitarist thingymebob and though it was time to get a bit of drum discussion going on.
IMHO
1 -
Thomas Haake -
Meshuggah 
King of Polyrhythms
Then, in no particular order:
Mike Portnay -
Dream Theatre
Danny Carey -
Tool
Gavin Harrison -
Porcupine Tree
So yeah, what's everyone else think?