When I was kid I thought Alex Van Halen was the king of showmanship with his huge drum sets. Neil Peart ranks number one in my mind now. Lars Ulrich and Nicko McBrain (Iron Maiden) are great too. There's different categories of drummers. You have the ones who can play the blistering metal, ones (like Neil Peart) who can play incredibly complex and off beat, and very precise rhythms, and then you have the background beaters. I thought the guy who played drums for Stevie Ray Vaughan (Chris Layton) was outstanding. Oh yeah, the drummer (Mike Portnoy) for Dream Theater is crazy good too.
Oh yeah, and then there's the whole Jazz scene...