I'm on Durotan - a german PvE server (horde).
I currently am playing 2 teams: my lvl 60 clothy team and a second team with a more traditional setup (war, healadin, 2shams, firemage).

The reason for this is that I came to the conclusion that I really do want a traditional setup with a warrior so the possibilities were leveling a warrior or leveling a completely new group. I went for the second so in some distant future I'll have 10 level 70s with the following advantages:
* ability to play different mixed setups depending on the encounter
* ability to transfer 5 chars to new accounts and try some ten boxing

When I am ready to try the 10box thing (which i expect to be around xmas, possibly spring next year) I am happy to transfer my whole bunch to a european multibox server joining fellow multiboxers and trying e.g. 25man encounters with 5 people

Bunny

PS: @shogun I think there is no way to get into bwl with a 5 or 10 box team. The first encounter is just too hard in my opinion (as always: I whould really like to be proven wrong )