Gene Holigan(sp?), Strapping Young Lad/Deathklock- pretty sure he uses 4pc. with deathklock(at least live I didnt think I saw/heard 2 floor toms)........ and he rocks. Probably the most solid metal drummer I've seen live.
Ringo Starr from The Beatles had a Premier Rootbeer Swirl Duroplastic four piece set at the beginning of The Beatles, and had 4 Ludwig Black Oyster Pearl 4 piece sets from then on. On his last Beatles kit, he had a Ludwig Hollywood 5 piece kit. All this can be found at http://www.ringosbeatlekits.com/ .