I think these days most people are saying not to invest in a rig as it'll be hard to hit ROI and because of the upcoming change to PoS. However I look at it as a rig that I can mine ETH as long as I can then move on to the next most profitable coin AND the cards / rig will always have some sort of resell value.
That being said a 2 GPU rig is a great place to start, I would highly recommend the 1060 3 or 6GB variants are fine (ETH DAG still wont exceed 3GB til next year sometime). I think the 1060 is the best bang for buck as far as cost/hashrate goes.
Thanks for your thoughts on the matter! I am interested in getting some sort of ROI, I'm not in a hurry for it though. I also just find the prospect of building and running a miner interesting. What's a good community, a message board or reddit, that you'd recommend for me to learn more about getting started?