Enough money to buy any reasonably priced GPU up to GTX 1080 Ti.
I think 1080ti is too expensive, personally I choose 1070ti besides its cheaper price also hash rate not too far with 1080ti in the same algorithm.
What?
My best 1070ti gets 440h/s on Equihash, while my best 1080ti gets 700h/s... both with the same overclock 75% power limit, +100/+150
1080ti is the best card all around, they are just too expensive right now. Wait a month and they will start showing up on the second hand market as people start preparing to buy the 1180.