to complete my last post : if you can macro for 2, you can macro for 5.

My favorite duos :
1) BM hunter + Elem shaman : strongest duo in my view, very easy to play,
2) combat rogue + equi Druid
3) affli warlock + disc priest
4) unholy DK + holy priest
5) and my trio : holy pala + 2 iae mages.