Which is the best duo for say 50+

[pepper22]

To all you lucky high level characters out there. What do you feel is the best duo for levels50+. Due to the new job, I have some severe time constraints and I am coming home pretty late,so I am finding myself pretty much forced into 90% duo'ing with the wife, and that is fine, she is great to play with, but I worry about leveling up after we hit 50. Right now(after 3 weeks or so of playing fiesta),we are using my 42cleric/her 40mage. She also has a 43 cleric that she solo's when I am at work. Anyways, from 20-40 we AOE'ed it up and now I am starting to worry that just the 2 of us are not going to be so effective AOE'ing much longer. I was thinking of starting a fighter or archer and duoing with her cleric,but I just don't have much of a clue as to what we will be facing at level 50.
Anyways, what do you guys/gals think about this? What would be the best duo post 50, XP wise? WIll the cleric/mage aoe combo still work well? Or would a cleric/DD combo work better??