Don't even consider to invest in a miner at this time. Eth can't be hold on POW too long...I think in a few months GPU miners will be completely useful. Check Antminer D3 from www.bitmain.com. I think pre-orders are still open...or just buy crypto. If you want to mine ZCASH you also can look for some GTX1070s...but they are still expensive. Thanks for your consideration.
RE: My crypto-story.Part 1.