CTEK(they make the Porsche branded ones) or NOCO battery tender. There’s plenty of tire psi recommendations out there, there are also stands you can put under tires to stop flat spotting. There are little dehumidifier canisters you can use in the car and garage to help keep things dry. Nice indoor car cover from Amazon is pretty inexpensive too.
That’s an honest take…agree on all points. Plan to stick with my 996 C2 for all the reasons you called out.
My upgraded stereo gives me all the things I was missing (AA/CarPlay, backup camera, TPMS, oil temp, and more).
Eventual engine rebuild will most likely go to a 3.8L, a 4.0/4.1L is probably overkill for me.
A 997 has a more modern look to the interior, and keeps most of the driving feel, while for me, the 991 just doesn’t give me the same vibe.