These are great threads, lots of opinions and theories. Impossible to quantify as it is such a personal choice, much like asking "what is the best color?". Although Dwight Schrute know's that color is black. My personal favorites would be.
1. Nicko McBrain-Iron Maiden. Unique style, looks like he is only hitting half the beats he is really hitting. Doesn't take himself too serious. Amazing drummer.
2. Neil Pert-Rush. He is Neil Pert from Rush.
3. Peter Criss-Kiss. Nothing amazing, but probably impossible to count the number of drummers he has inspired and influenced over the course of his career. Solid drummer.
4. Alex Van Halen-Van Halen. Amazing drummer with a style all his own.
5. Clive Burr- Iron Maiden (The early years). Because what up and coming drummer of the late 80's/early 90's didn't want to master the opening moments from "Run to the hills"? Also because I love Iron Maiden