I'd rather get 1080 instead. Right now it's only about $20-ish more than 1070Ti, but has the same TDP as 1070Ti, and gives significant more hashrate (okay, probably not for memory-intensive algos like ETH...)
Availability is a big factor too and in many places the 1080 is OOS or priced ridiculously higher than the 1070ti/1070. Mining right now is really just what you can get at a price as close to MSRP as possible.
I just ordered two MSI 1080 Gaming X for $569 each from B&H few days ago. No tax and even it has an ongoing mail rebate $10 for each, so essentially it's $559 each, which is only $10 more than NVIDIA's FE MSRP.
It looks like the availability of 1080 is about the same as 1070/1070Ti nowadays, just setup email notifications and account/billing/shipping info ready, it shouldn't be too hard to get one actually.