Your given up to 6 Roles (Specs) - Purchased with in-game currency of course. With new toons i usually purchase the first 2 additional roles which are fairly cheap to obtain. That usually last a good while.

If i restart fresh again, i will most likely looks at a 5 cleric team, or something with a Cleric Tank + Cleric Healer, 2 Mages, and a Rogue. Warriors dont seem all that fun to me anymore. They are still amazing tanks, but i like my cleric to me my main again, and being already setup to Tank is a Plus for me, because caster/healer gear comes quickly.

On second thought, i really have no clue what mixed group i would do. Im the type of person that wants at least 1 of everything in a mixed group to take advantage of everything, but then again if i think of it like Paladin + 4 Shamans setup. I would probably do 1 Cleric Tank + 4 Rogues or 4 Mages, or maybe even 2 Clerics and 3 Mages maybe. choices ... choices.... i will really need to ponder on this, but in the end 5 Clerics is just amazing....