Hi,
Just noticed you're most likely also from the UK (the btopenworld bit gave it away

).
If so, whereabouts in the UK are you based?
You are right about the Mk2 GTIs being rare, DX engines were and still are lovely engines, and you may know that they culminated, at least in the UK, in the absolutely gorgeous Storm special edition, introduced in 1984

Not that I'm biased in any way
If you are in the UK, you may also have noticed that unless it's a Storm, general prices for Roccos, especially Mk2s are rock-bottom at the moment, unfortunately attracting the wrong sort of people to this car. Don't stick it on Autotrader, try some of the enthusiast's boards on the Internet, e.g. SciroccoWorld, The Golf magazine, etc.
But why are you planning on selling it? At least that's what I assume you're planning to do
Tempest