I mean steam already provides information on controller support, and will tell you if a game supports the controller you currently have plugged in. Afaik they don’t even sell steam controllers anymore.

Assuming you have at least a 5.1 capable sound card, the Edifier S760D is the best powered surround set up I’ve been able to find. There really doesn’t seem to be a lot of options anymore but for gaming and movies/tv the surround is definitely worth it.

Edit: Though looking around it seems like they’re basically impossible to find atm