I went "raf crazy" a couple of years back and levelled 5 of every class to 80. (10 on Druids and Mages)
However now I only run a mixed team of DK, Priest & 3x Warlocks @ 100.
Also a team of 5x Hunters (just hit 80).
I have a 6th account with a lvl 100 Paladin & Mage @ 88