You’re not stuck with just the 1TB model.
Rarely, if ever, has there ever been a pre-reveal leak as thorough and extensive as the one for the PS4 Slim- at least as far as the Slim is concerned, it sounds like just about everything that could have been revealed for it has been leaked already. I actually feel a bit bad for Sony, who have doubtless been working hard on a reveal and launch for months now.
The latest thing to have come out from the leak? The existence of a 1TB PS4 Slim model. According to Twitter user shortman82, the model that he got, which comes with 500GB of on board storage, is not the only model of the console in the works- the manual that comes with the system mentions a console with the model number CUH-2016B, apparently coming with a 1 terabuyte hard disk drive built in.
This means that you won’t be stuck with a paltry 500GB of disc space (seriously, thats just about 10 games installed on disc at a time at most) if you do want to buy a Slim- you’ll have other options, too.