Since you have some cc you should still beable to do it with War. Wars have more options for armor and some of the best tanking can be done , but it requires a lot of micro management. War has to be your main. I run with 1 war 3 mages and holy priest I prefer war for some instances . I also have paly on same account as war to tank other inastances that are not war frindlley. it all depends on instance. My war is undead so wotf is nice.

I also run with 1 shadow priest and 4 locks on pvp server, this grp can do all normal instances but can not do many heroic ones. blueberries do not stand up well but since there are 4 they can last long enough for dps and fears to do the job.

The easiest grp to do Herioc for me so far is Paladin 3 mages and Holy priest. I m working on 5 druids , 5 shammy and 5 hunters. so time will tell.