Bill Bruford, BJ Wilson, Neil Peart.
I am not even going to go into technical prowess, it is secondary to originality and style. I will also mention Ginger Baker, John Bonham, Keith Moon, the rarely mentioned Jon Hiseman and especially Carmine Appice. I also want to mention Corky Liang (Mountain), who did was nothing fancy but had his part in setting the pace for modern rock drumming. There have been so many excellent players who have taken the precendents set by these players to new levels, true, but these guys were the visionaries (IMO).