Varden's keep is indeed one of the best dlcs I've seen. Really fun to play through. Aside great gameplay, the storyline behind Keep is quite fascinating. It raises an intresting ethical question: How far are we ready to go in a fight against evil? Can wrongs be forgiven if the goal is noble enough?
By the way I hope you didn't overlook the blood potion vial on the table in Mage's tower… Drinking it adds whole new set of abilities on your character. I recall that it activates the power of darkspawn blood you drank during joining ritual. The player could also crush the potion if he hated blood magic for instance.
Keep had lots of cool gear too which werent overpowered. Like the warden commander armour, beautifull and deadly silver warden sword, a really nice ice staff, deadly croossbow etc. Also once you have finished the keep quest, Levi and his brothers will start selling nice gear to you.
In addition if you can find a meteor stone from the gameworld, levi's brother can craft a really nice sword from it. Likely one of the best weapons in entire game.