Thank you! They're great cars and I love mine. Price correlates with miles/condition. Here is a good example at Merit Partners:
https://www.meritpartners.com/featur...e-911-carrera/
When mileage gets above 30k the price should drop by at least $10k. IMO cars with more than 50k miles go for less than $100k currently. C4S seem to be ~$10k cheaper at all mileage levels. Black or silver seem to be the safest bets. More "rare" colors like yellow will take forever to re-sell so I'd bet that they end up often going for less.