Orsik can double up as striker, but is not healing heavy, so ideally we would take strength based cleric to soak some damage in melee or both cleric and (sticky) defender - fighter would be my preference. On the other hand, paladin is not sticky, but offers emergency healing and minion clearing mark...hm, tough choice 
In L4W I'm playing wilden shamaness, she's controlery healer and provides 1d6 extra healing on her healing spirit so that's an option too.

In L4W I'm playing wilden shamaness, she's controlery healer and provides 1d6 extra healing on her healing spirit so that's an option too.