You should just play what you like tbh, I am still playing my Witch Doctor too even though it is not the best thing.

But it doesn't hurt to level a demon hunter on the side. There is a fast way to get to level 60, Siege runs. It is pretty boring though, so I have only leveled my demon hunter up to lvl 37 so far as you can here:

http://www.youtube.com/watch?v=sD_pw5L7G8s