Skimming through the S12 EU 2-man leaderboard (SC) briefly, it would seem that there are two main configurations present:
Inna Monk + Fire Wiz'
Support Necro + Rathma Necro
There is the sporadic Crusader in there as well, but for the top 200 or so, the above combinations seem to be the most prevalent. It's worth noting that the majority of those players have well over 2000 paragons, some even upwards of 3500, something that's quite hard to reach without excessive gaming I would say. (Personally I tend to look at people with 1000-1500 paragons for my benchmark, and even that requires some focused gaming in the season.)