How many versions Gran turismo's are there?

[GT4 Master]

I am a huge gran turismo collector but i was wondering how many versions of gran turismo there are gt1,2,3,4,5 etc.

All the regions special editions 1 offs and dealer and press kits.and bundles of course.

 

[Famine]

A couple of weeks ago there was a thread posted about people's GT collections. While you won't get a definitive answer out of it as to exactly how many versions there are, you will at least get an idea of some of the many tens of unusual versions from comparing the lists of what games people have.

 

[TopGearDog]

Does that include or exclude Prologues and Concepts?