I'll add an agreement to the 5-hunter first group. You can always swap in other alts to fill out the additional slots as time permits. I just find my hunters to be really, really versatile for so many different tasks that it makes them a primary choice for tons of things. Prot Paladins were a very close second, with tradeoffs depending on those rare fights that either hunter or paladin would make easy versus impossible without a pocket healer.