Water pump or thermostat?

[Jeeab]

Hey all, yesterday my boxster started cooking on me

While driving, I noticed my temp gauge starting to rise and eventually maxing out. Thankfully I was only a blockaway when this happened.
When the temp got to max, my oil light turned on and I had a knocking sound come somewhere under my feet. Side note is that the heater was not blowing hot air even though the car was cooking itself.
When I got home, I popped the trunk and the antifreeze cap was boiling over with steam.


My searches lead me to believe that it could be the waterpump, however I replaced that on September. Other thoughts is maybe the thermostat.

What is also unknown to me are those loud clunks that started happening when that oil light turned on.

Should I be buying a thermostat first just because it's cheaper? What do you guys think?

Thank you