Best duo - non twink

[Nexii]

1-50 I'd put dual mage ahead of ench+cleric
50-60 untwinked ench+cleric is probably the best
if you get epic then I'd think that any 2 out of druid, sham, necro would outpace ench+cleric with mass root rot
bard+wiz also could level pretty fast I'd think all throughout