Vinwiki did a series of these for various budgets - $15K, $25K, $35K, etc. You might have to up your budget a bit from these slightly-dated numbers bit due to carflation:

I guess there are a few people out there who want to own the worst car in the history of the world. Are you aware you'll have to periodically look at it?

https://topgear.fandom.com/wiki/Lexus_SC_430#:~:text=The%20SC%20430%20was%20featured%20in%20the%20Top,%27worst%20car%20in%20the%20history%20of%20the%20world%27.

Have you considered the Miata, BMW M4, or other hardtop convertibles?

That is disappointing to hear. Lower back support is about the most important thing in a seat, and a seat is a pretty important factor in a car. Have you tried all of the various C8 seat options?

Surely you know this already, but try to get 2009 or newer to avoid IMS issues if possible.

I'm in the same boat trying to help my dad find a 911, likely a 996, 997 or 991.1. I think he'd be open to either a manual or PDK (but not a Tiptronic) if anyone has a lead.

The designer of the Miata just died, likely in part due to your betrayal.

LC500. They look pretty awesome IMO.

We are S2000 twins. I have a 2003 Silverstone as well.