i basically quested all of hellfire peninsula, terokkar forest, and zangarmarsh, anywhere else thats really good for my level?

I haven't played in several months, but I believe there is a dungeon finder, so you can randomly team up with players in certain dungeons as many times as you want, so long as the dungeons you're looking at are around your level. But if you prefer questing, go to Nagrand - there are almost endless amounts of quest there.