Not sure why you would pick the 56 over a 1070ti. The 1070ti is the superior card, more efficient, and will hold its value better.
That is the great dilemma i have but i prefer the rx56 for the monero efficency, almost 2000 MH/s per card! While the 1070ti or 1080ti seem to be more "versatile", the rx56 does one thing but very well.
Not sure why you would pick NH over doing some research and earning more at other pools. Perhaps even double.
NH? I plan to mine XMR on a classic pool