My experience of the mkiii is mainly from my '92 UK spec NA auto I used to have. I loved it but it was down on power a bit. My uncle had a mkiii uk spec turbo auto when I was younger and there is definitely a difference. Mainly the turbo had a bit more of a slingshot effect out of the corners, which is to be expected.
I had the head gasket problem on mine at about 120,000 miles, so be sure the work has been done as they all suffer the same fate.
It would be exclusive, you don't see them anymore. Cool looking car too, especially with the jspec tail lights.
They tend to go for hundreds though, not thousands. I got less than £500 for mine.
Edit: mine was vandalised though and needed a windscreen.