[Duncon]

Tank and healer is a good choice. You will not be the fastest killing duo, but the defensive nature of the team gives you good wiggle room for learning. As you mentioned it is also a great start to a group.

My brother and I play a cleric - paladin team and it is great. Duoing, small groups, large groups, it all works. There are stronger strictly duo matches, but I think tank - healer gives you the best transition from duo to group.