I would have to go with 2 warriors, human/Giant/duergar sword specs as first spec, second spec can vary a little with "Bard/Healer/Transmuter".Warriors swap off tanking, third rests/sleeps a majority of the time between healing/prepping/maldicting.
Three Paladins get silver/wrathing weapons asap, powerrank on undead, I could see the right three guys getting to hero in 20-40 hours (depending on if they have to go gather their own gear or can get Decked from rank one from a noble benefactor. Assuming all are dedications that can tank well, just rotate tanking.
I would definitely stay away from Invokers/Necromancers/thieves/APs/Conjis.