Would definitely vote for Monk/Sham. I played Monk on live, and not only did I keep a running list of the important group classes (war, cleric, enc) I also kept a separate list of Shams for duo purposes. Very powerful, effective duo for just about everything, including dungeon crawling. The monk has some work cut out for him/her but with a good handle of pulling/splitting that partner can hunt in dungeons effectively for sure. Holding aggro isn't a huge problem. Adds can be tricky, but careful pulling can mitigate this issue, and some root CC can help. Plus with slows, both the Monk and the Shammy can take a surprising amount of a beating, so pulling aggro or even split tanking isn't a disaster.
My brother played Sham on live for a bit, and I *gasp* even did some boxing later on. He was lower level than I was but... in our 50s duoing most of the old world was doable (Once I was epiced, the world was our oyster... especially the old world. Freeti, Fire Giants, Anything in LGuk, some stuff in KC and Seb, etc) Good EXP/Money Making potential in there and lots of fun.
Other thoughts:
Not for dungeon crawling, but Nec/Dru is one of my favorite combos for outdoor areas and pure levelling if you want a random suggestion.
War/Cler would be fantastic for the option to group more in the future but for pure duo it's not all that great.
I haven't checked but if my memory from live is accurate I'm about 99% sure Shady is indiff to all. So no worries on the ikkie front.
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