i'd advise you give the chaplain a command squad personally... while the assault squad has the jump packs, the command squad can get the furious assault skill and thus will strike *before* the 'zerkers! dead models can't fight back and combined with the chappy's re-rolls, you should be able to cut down a good deal of the 'zerkers attacks!
plus, you can also pack a pair of meltaguns to easily vape a couple of those raging nutters before your charge! (and unlike plasma, there's no side-effects!)
as for using a dread to take down a lord/prince - beware of not just d.stature, but also combinations such as daemonic strength + dark blade and/or melta bombs!
cheers!