Green stuff are for small or low powered cars and not really ideal for the GTI
Yellow stuff are trackday pads and will destroy your discs. Red stuff are the road/trackday pads
I wouldn't be paying £400 for that set up either way.
I just out ds2500 pads and brembo. HC discs on my clio and they're superb on road and track. No squealing, they work from cold, dust levels is less than the OEM brembo pads.
I would suggest trying these pads on the standard discs and see what they're like.
The newer style EBC red stuff pads are meant to be good but I would rather pay the extra £20 and get the ferodo pads which are well proven.