First of all tell us what your rig (dedicated multi GPUs PC) is, if you have a rig, if not what mining equipment you have so we can give you the best advice.
I am not a professional miner, since I mine here and there mostly for fun, but I know for sure mining BTC, LTC, DASH with a GPU is not worth the pain, you won't be able to pay your electricity with the mined coins.
Anyway there are few coins that are still profitable to mine with a GPU, even a CPU out there, even tho you won't make a lot of money. You'll get some experience, you'll learn a lot of things and you probably make some friends around the space.