Dont you dare bring that to Chesterfield!
I think there are already three here, but then again I know two of those were sold, and I havent seen them in a while, so perhaps we are back down to just mine around here, so there should be room for two of us
The only extras above the GT pack are a numbered plaque, the different wheels and of course its yellow.
When new they came with a playstation and a copy of GT4 the game. Ive never known a second hand one still come with those, so dont go looking for it.
Over time the wheels have become more common as they were fitted as standard in Eire on some models (looks like they had some of these wheels left over), and the engine become the norm for the Z about 6 months after the GT4 came out.
Really you are now only paing for the uniqueness of the yellow imho.
Beware, if it needs paintwork, finding someone to match it could prove a pain - but I know a bodyshop in chesterfield that know how to do it now (just in case you were thinking of a bodylit at a later date).
Hope that helps