Just some quick stuff, There are lvl 70 heroics too, not only 80, also there are 10-man instances too :) When I manage to read the whole topic i'll tell you more ;)
Another thing, Retribution full pvp char? No! Retri's dps is magnificent in instances, also keep in mind that a prot paladin is amazing in pvp too. Avenger's shield ( silence , slow, aoe) Hammer of RIghteous (amazing damage aoe) Holy shield (heal on block , combo with Redoubt)