all those newer boards will only support W7 in a VM, so anything beyond Skylake i*-6* will not cut it for you.
The 1060 6GB is faster than the Quadro 4k by a reasonable margin, there is no need to upgrade that.
I think you have 3 avenues:
1) go for an old haswell board with an i5-4590 or newer. This will give you a notable performance boost for very reasonable money. Upgradable to i7-4790k or so. I could be talked into letting one go ...
2) go for a Haswell X99 quad channel and a Xeon E5-26xxv3. If you can get hold of that, it's still good bang for bucks. However at least 3 times as expensive as option 1)
3) go for a skylake board and an I5-6500 or better. Decent boards, decent performance, about 2 - 3 x as expensive as option 1)
4) get an x370 or B350 board, mount a Ryzen 5 3600 on it and knacker around until you get W7 up and running. Once you do: 2 - 3 x the speed of 1). Fastest of all options listed, but most expensive one.
1) you could potentially get for 100 - 120 Brussels Pesos (board mem, cpu) plus shipping. It will work with your 1060.