I was under the impression that the expensive PS3's extra features will be non-game related, like perhaps a DVD re-writeable drive, a TV tuner, etc., much like the PSX. If this were the case, both systems should play all games. However, the hard-drive thing could be a problem, since it can become a game-related feature. If the expensive version has it and the cheap one doesn't, it will cause confusion. But, much like this generation, I don't think many games will require it, and maybe it will be sold separately for people with the cheap PS3.