Looking to purchase the original Xbox. Never owned any of the Xbox's, but figure the games are cheap now. Have several questions...

1. Whats a decent price? I see $40.00 on Ebay, but what have others been able to recently buy for? In USA. I could also check out local thrift stores.
2. Are there different revisions I should look out for? Does it matter? Like, as significant as Gamecube's digital ports vs. no digital ports?
3. Any neat mods that can impact graphics quality or QoL (not just cosmetic)? Like an HDMI mod? I see you can swap out Hard drives? I recently got into soldering, so I can use that "skill" if its not too terribly difficult. Can you put in an SSD?
4. Is component the best quality without mods (if other mods exist)? I have a component cable meant for PS2/Wii/Xbox. https://vshare.onl/https://omegle.onl/
   
5. Power cable is the same as PS2/PS3, right?
6. Is there an adapter for using a USB controller? I own a Logitech F310. I also have a converter meant for Gamecube & XBox, where I can use a PS2 controller. Or is an Xbox type-S controller preferred for a specific reason (outside of personal opinion/preference)? Hope that makes sense, thinking of like pressure sensitivity buttons.
7. Are games region-locked? Any games worthwhile that was never released in North America?
8. Anything you would like to add for someone who has never owned an XBox? Honestly, still debating if its worthwhile, as I have a beefy computer. I find owning original hardware can be a fun hobby, especially if I can mod it in some way.

Thanks!