With destro if you have CH buffs wich means VR too , you only need a BD and a bishop (major heals aren't aggroing mobs). This is for destro/WL
At high lvl , a good setup is SM/COV/Cardi/SD. SM have renewal.
It's better for destros , at high lvl to go FOG and let WL clannies in catas.
For example go with a party like that in disciples. Settle near a good spot with 2 big rooms. Sws in a corner , BD in other , so they can't take full D/S , only COV'er,WL and bishop. In this way you can take a leecher with you so he can pwrlvl. In this setup he can take 10k xp / mob on retail.