So now around 13-15 years old?
Depends what has been done already and what will need doing shortly.
85k and that age is the age where you have to consider.
Suspension. Controls arm bushings will be starting to age and go hard, dampers could need replacing, top mounts, bearings, roll bar bushes and drop links etc. Could be up to £4k to get it all feeling factory fresh.
Coolant pipes. Hopefully already done. £1000.
Brake lines, now at the age where they could need doing, quite a big job, around £1500 and worth doing when the gearbox is out, which brings us onto clutch and flywheel, oh and may as well do transmission mount while in there. Another £1200.
Brakes all OK? New pads and discs all round are another grand.
All tyres in good shape and not more than 3 years old? I replace mine at 4-5 years regardless of depth.
Definitely no sign of any bore scoring. I know less common on the 997.2, but can happen.
I could go on. But you get the idea.
Seriously, asking on a forum is pointless, without know the car and seeing the history of what has been done we don't know.
If everything has been done, could be £36-38k if the right spec.
If none of that had been done I would want to pay £30k tops in the current market.
One ended on collecting cars last month for £24k including fees, which is not the normal market but shows where things are currently.
In all honesty, buy these with your heart, but with eyes wide open.
If it is the perfect colour combo and spec and that is worth £5k or even more to you, pay more, there is no right or wrong with these.
Why don't you put a link up to the car and ask for opinions? You obviously know the price already if it is advertised at a dealer? Problem when people ask this question is they don't often like the answer and then get all offended.
It is worth what it is worth to you.