Any dma card works, avoid Lurker, immortal, RangerDMA. Just look any exclusive brands that advertise hard enough is a red flag. All boards nowadays uses same chip with diffirent names. So think like an android phone they all have same chip, same stuff just diffirent name.
U would be good with any card with 35T 75T chip on nowdays. Prices atm are $165 FPGA Dma Board, if you paid more you prob got upscaled on price. You can always get help from people like itoro for purchase directions or purchase one of his bundles.
Custom FW 1:1 theres a lot of people selling it nowadays, they all most likely come from same source (china).
Now also dont forget KMBOX, do not buy the Net version buy the KMBOX B PRO version, NET version is fairly new and bugged.
Fuser is also something to keep in mind if you want good response and ESP on your main pc, otherwise you would need gamestream from 2nd pc to main pc, it will be delayed.