I don't want to rain on your parade but I wouldn't get one without aircon (harder to resell, although no doubt someone will be along shortly to say 'Put the roof down!' Well, trying doing that in the middle of a traffic jam in blazing sunshine and 90% humidity, or when you want to demist the car quickly in winter. End of rant) or that colour (I like it, but again a hard resell) or with that colour leather (hard to keep clean).
Right, now I've got my unsolicited opinions out of the way, the things that have gone wrong with mine include:
1. variocam solenoid problem (both banks but only one in my ownership -- a £400 sort)
2. leaking doors -- £50ish for the membrane
3. cracked coils --- £25 a cylinder
4. the discs tend to corrode badly if you don't dry the discs off after washing
5. ignition switch fails -- a £35 part from Audi to fix
6. aircon condensers and lines corroded (not a problem you will have with this one)
7. spoiler a bit sticky -- WD40 holding this off at the moment but I think it's going
8. plastic window cracking -- a new glass screen top for £750 is in my future
I've had mine about four years now I think, 62000 miles iirc, 97 model. Been quite a good reliable car despite the above. Have got a hardtop for it and put in a rear parcel shelf and speakers and a heated rearscreen switch. 996 console, OBC and cruise in the future.
Other things I've seen on the forums are oxygen sensors packing up (£50? a pop), mass air sensors needing replaced (£165?), expansion tanks leaking, etc. Worst is when engines blow up. I would say that 2.5s don't seem to be too bad for this but I know I'd get in mine and then hear a bag of spanners get blown out the exhaust. Oh well, a chance to put a 3.4 in it...
What options are on the boot sticker. Any photos?