That is an incredible deal, Ken! Congrats, and welcome to the club.
I do prefer the thermo in the lid (rather than the handle), but it's not a huge preference. If you ask very nicely, Weber will sell you the modern thermo and bezel for about 13 bucks and you can carefully drill through the lid and install it. Which would look a little bit like 'belt and suspenders', but it's your Performer, so do what you like. Or if you're wanting to spend some of that money you just saved, you could buy a new lid direct from Weber with the thermo built right into it. I think they are right around 60 bucks.
Srsly, dude, you killed it today. Nice score.