Buy 1080 ti, check HiveOS, buy decent cpu on each rig, you will tank me later because you will rock 5he Market next 3 or 5 years. There won't be better advice Trust me 😉
Great recommendation. Also 2070 and 2080 if you can get them in a deal.
Try to buy always 3-fan-cards if you haven't the best cooling solution. If you cant cool your card enough, you can drop the original fan-block of your cards and just zip 3 of these fans onto them (which also increase your resale value because of never used fans!):
https://geizhals.de/?cmp=1187156&cmp=1204784&cmp=1165585Finally the new 1660 Ti is also a great deal! But go with 2 or 3 fans here, not the 1-fan ones (always remember the resale value!).