You can find brand new Ryzen 7 2700X (8 cores) for very reasonable prices after the last price cuts (we're a few months away from the 7nm ryzen 3rd gen).
If it's still too much a Ryzen 5 2600(X) (6 cores) is still a very good processor for almost any use case.
About hackintosh and AMD, that's is not only possible, but also not too complicated to achieve on Mojave (see https://vanilla.amd-osx.com/ for more details). Older versions required using custom AMD kernels, but some guy figured out how to patch the vanilla kernel for Ryzen and Bulldozer straight from Clover; it's not as simple as using Intel, but it's much easier than it was a few years back.
If it's still too much a Ryzen 5 2600(X) (6 cores) is still a very good processor for almost any use case.
About hackintosh and AMD, that's is not only possible, but also not too complicated to achieve on Mojave (see https://vanilla.amd-osx.com/ for more details). Older versions required using custom AMD kernels, but some guy figured out how to patch the vanilla kernel for Ryzen and Bulldozer straight from Clover; it's not as simple as using Intel, but it's much easier than it was a few years back.