I started with a group of five shaman as I was new to multiboxing and wanted an easy life. Shaman can fulfill a variety of roles and it had been demonstrated that they were viable in PVE and PVP. I was sorely tempted to go the Paladin + Four Shammy route but chose the easy life.

That lasted until level 7 when I deleted the Shammy from the head of my snake and replaced her with a Paladin. That's worked out very well.

I'm already thinking about respeccing the last shammy to resto at some point.

Once the group's at a respectable level, I'll be throwing a druid onto the healer account and three mages onto the DPS accounts.

I also have plans for a priest on the healer account and a duo of boomkin druids.

I don't have any desire to run a (for example) Paladin/Mage/Lock/Hunter/Priest group but you never know. I do like to write macros and design user interfaces but I like to spend at least some time actually playing the game