There is level 50 PvP still, however, people usually on get those from Roulette so it's not that active... mainly you're gonna be playing 60 PvP. The iLevel is capped at i150 so that gives you a chance to mix and match lower iLevel gear to maximize your secondary stats. Aetherial/Pink/Diadem gear DO NOT give secondaries stats, just main stats.

If you are going to play tank, PLD is more of a supportive role and can really help lock down healers. Cover is very helpful if used right. WAR have A LOT of survivability. Fel Cleave hits like a truck... I crit over 5k without Battle High/Fever. You can also Purify your own Holmgang. Also tank LB is a big damage reduction, don't underestimate it.