Il offer up some info from personal/family experiance! Hopfully somthing helps haha
My dad has a 996 facelift, the 3.6L C2, basalt black hardtop.
Incredible car! He loves it to bits! Got a lovely low miles example about 2-3 years ago. (Guy that owned it from new has a F430, Lambo, aston etc etc lol )
He has had zero issues with the car. I think the problems are more so with the pre-facelift 996, the 3.4L
On the topic of the 996T, its a 'known' point that all problems with the 996T go before 40k i think it is, if a 996T reaches 40k miles, it will now live on forever and ever haha
Basically there has been little to no reports of problems after this milage.
Only thing to bare in mind is costs. Service, tyres, brakes etc etc are costly, and if you want to retain the value of the car, you are looking at porsche dealership or a specialist.
Luckily we have a porsche specialist local to us who is a complete wizard! He has forgotten more stuff about porsche than most guys know lol
Where abouts are you from?
Some prices off the top of my head:
Back tyres = £600 (full set just over £1000 i think) (insurance companies stipulate a certain rating of tyre of the insurance is void)
Disks and pads all round bought from the dealers (Not fitted) = £1200 (If a mechanic etc buys these, they are obv cheaper on trade price)
Service = around £400 i think
Also you can find oil can lie in the cylinders after a good thrashing, then on next start up a cloud of smoke. Doesnt always happen but is a characteristic of the engine. Nothing to worry about really, providing it clears immediately and isnt a constant stream of smoke obv haha
One point to note is, just driving my R, he said, in some ways he preferes mine and doesnt think his is all that much quicker, altho on paper is definately is. Iv driven his a few times and it is a lovely car and great soundtrack too
Of course most of what i said is 2nd hand knowledge from what my dad has said, so I may have picked a few details up wrong, so do correct me if im mistaken! lol
One thing to note is a member on here, Robin, he has both an R32 mkiv and is a porsche specialist mechanic (works for the guy i mentioned above), and Robin is a complete wealth of knowledge and a top guy! So he may be the best guy to answer some questions about what issues there are to look out for etc!
Can't think of anything else at the min, but any questions just ask and il ask the old man the answers to them sure!