Pay attention to the POS mining, this trend is gaining more and more strength.
It's probably not the best idea to buy graphics cards now.
I guess a lot of people are staking right now than actually going the mining gadget way and I believe over time, we may actually start getting to see more POS than POW. I totally dig this as it is always good to follow trend in whatever you want to end up doing and it would not be a good idea holding some GPU that will end up utterly useless in the long run except to be generating dusts wherever you keep them.