I would stay away from ETC it hasn't really performed like the others mentioned here.
Waves, ARK and Monero are the ones that I have been buying. A little every day.. no one knows where the bottom is.
This is my strategy, too. Buy a little bit at a time and check the price back later. If it is still going down, buy a little more. It's called accumulating, and oh you know the whales are doing that (probably on a much larger scale) right now too.