hi
Sorry this isnt a direct answer, more of a relevant sidenote:
ive used 5xprot paladins and had good success in wod dungeons and recently started on heroics, i was wondering myself if 5 brewmasters would be similar? they have the essential elements that the paladins have - ie, they can all heal and have defensive cd's etc
I know you didnt mention 5 x tanks but dont rule it out, tanks do great dps now especially with bonus armor.