imo 2 options

i guess you are gonna RAF Link the 4 new accounts to your main ?

in that case.. roll a moonkin.. or a paladin on your old account
moonkin, for the pvp addition of the aura, more stacking for wotlk
paladin, to switch to paladin in order to tank in wotlk


imo.. if you dont have 5 accounts yet.. use your main account to send out 4 raf invites to your own email, and open up 4 new accounts that way
this way when you level 1 team to 60, you have 60+60+60+60 /2 = 120 free levels to grant, ie. level 1 team, get 2 char's for free

its what i did.. my 5shaman team is now lvl 69, but i also have a lvl 60 paladin and oomkin, which i might level up later on