@philipma1957
Do you think the T17 38Th/s for 1145USD is a good price?
I think it is. Considering they sell for $3000-4000 on eBay or Amazon.
Efficiency is not quite as good as an S17, but the ROI would be quicker.
If you have the physical set-up for them (enough power, exhaust set-up), you can buy 2 T17's for 80 TH, for less than one S17 at 60-64TH