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Templar is pretty underpowered now compared to other things and needs that extra oomph from artifacts, Wardancer/Monk tank terribly without them, Predator and Ranger are both sort of lackluster in PvP right now. Ranger has some great utility but your 1v1 is neutered by smart parrying; Septus is pretty much impossible to kill as a Ranger now.
"On the battlefield I am a god. I love war. The steel, the smell, the corpses. I wish there were more. On the first day I drove the Northmen back alone at the ford. Alone! On the second I carried the bridge! Me! Yesterday I climbed the Heroes! I love war! I… I wish it wasn’t over."
Aside from the no-brainer lesson packages the monthly membership is the best way to advance. Easily the best value.
In your place I'd definitely look at Outrider. Powerful, fun, good at bashing, way more interesting than Priest.