That´s really hard!
Does somebody know whether the retail-version had "Disc-DRM" or not?
Edit: Amazon Reviews said it doesn´t---so I´m currently evalutating to buy this one...
I would say buy the disked version, and even if it has DRM you can just download a noCD "patch" from somewhere like gamecopyworld which will simply bypass it. I did that with my STALKER series.
I always thought that this game was an underated classic and the IP rights holders are the worst type of people for holding back this game from the public.