OP, good luck with your search.
Like you, I'm buying my first Porsche later this year.

Over the last few months, I've done an enormous amount of reading on the subject and I think I've narrowed it down to a manual 997S Gen 2 or a 991.1S, but haven't ruled out a 981 Cayman S if i can't find the right 911 in the spec I want.

If you can buy one from a reputable independent such as RPM Technik, Harbour cars et al, then I would go that route if your budget allows, but I think it should be stressed how important it is to have a pre- purchase inspection carried out prior to purchase by a reputable Porsche qualified person.

These cars are well capable of draining ones wallet at a rapid pace, so it's important you know what you are getting into and prioritise a comprehensive service history - preferably by official Porsche Dealer or Independent Porsche specialist over a car with low mileage and patchy service history.

I look forward to reading more about your search.