Well it all depends if u are going to have a cle merc or 2 for heals then i would go after some more DPS a mage or a nec would be very good dps and with a nec u wouldnt need to med to much. if u r looking for less down time i would go for a rog mnk or zerker they the 3 best mele dps in the game. if u r going to need a spot healer or slows or dps a shaman or beastlord would be best and the beastlord has the second best pet in the game. since u will have 2 rangers and a tank u might want to do a class that can help them out with their dps in that case a chanter would be a good choice it would be able to haste all of them and give mana regen to the rangers and mez mobs if u get to many mobs on u. the chanter can also charm mobs for some extra dps it all just depends on your play style i hope this helps; and that i didnt ramble on and on lol.