We had a silver CX GTi Turbo Series 1 car in very nice condition up for £3,295 with hardly a sniff of interest.
Meanwhile, a GTi Turbo 2 on the other hand was getting huge amounts of interest at around £4,995!
IMO, I think that they want the T2s just because it is the "T2" and that the Series 1s are as rare as hens teeth - around 150 for the UK IIRC.
I prefer the Series 1 look with the metal bumpers and "proper" dash though and it would be great if they put the T2 unit in!