Sounds about right mate. Best car i've ever had, you won't be disapointed, especially with a remap. Keep it well serviced and look after it and it'll be good to go for another 88K easily! Its not high mileage, it works out that its done about 8-9K per year so thats below average miles for the year.
As long as warm the turbo up (don't high rev the engine until its warm), and cool it down (don't high rev the engine when you know your about 5 minutes from when your going to turn the engine off) then the turbo should be fine.
The 2002 Golf GTI that your're looking at getting has the newer KO3s turbo instead of the KO3 turbo on the older GTI's (pre 2000 or there abouts), so when you remap the KO3s you'll get a higher BHP figure than with the KO3, so you'll be looking at about 200-210 BHP with the KO3s and about 190-195bhp with the KO3. You won't need to do any other supporting mods for the stage 1 remap, maybe a Forge 007p diverter valve as the standard Bosch one has been known to fail under high boost. You only need to do other mods if you do a stage 2 remap but you're talking $$$$$ 
No, 8 owners doesn't sound good mate, have a look on pistonheads there's a few nice ones on there. Don't rush into it there's plenty of nice examples around and already with remaps and mods done to them etc. Look in the classified section on here also. I got mine on Ebay 3 years ago with the remap already on the car 
No probs, if you ever need help or advice this is a brilliant website, I have learnt eveything I know about the GTI and Golf's in general in here from the nice helpful members, either I will help or someone else will be more than willing to help you out.
Can't you try and sell your car privately, you'll get more money for it that way, and then try and buy your new car at the same time as you sell your tdi, so your not without a car for a long time, thats what I do. I know its convenient but I begrudge selling my car to a garage as they usually give you bottom dollar for it.
It really depends where you live. My mate bought a 2002/2003 GTI 180ps with a few subtle mods (owned by a police officer) 60k on the clocks for about ?3,000.
Id definately be wary of the owners, i had a corrado and i was the 11th owner on a 1994 plate... i sold the car 6 weeks later...
I have a S reg GTI and i am the 4th owner. Was kept by the first owner until 100,000 then sold it so it was passed around within 20k. Looked like the new owners didnt want to sort out any work on the car. When i bought it i had to top up/flush all the fluids and replace the clutch and give it a full service.
i got my 2001 GTI, 70k on the clock for £2750 (im in the south east aswell). It was up for £3200 initially but i got him down. At the end of the day, a car is worth what you are willing to pay for it. I wasnt going to pay over £3k hence why i went in at £2500 and settled at £2750.
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