Yes, the master cylinders are different between ABS and non-ABS; it's been covered in previous posts.
I say that ABS is definitely worth having given the choice. In many situations where ABS will be useful it will take a very disciplined and skilled driver to not panic and jump on the brakes hard enough to lock them. Coming back off them is likely to make the situation worse. Even knowing the theory and intermittently practicing emergency stops. Been there, seen and done that.
This is not an aspersion on anyone's driving skills. Unless you are regularly practicing to the point where it becomes second nature - regularly using your road car for motorsport is about the only way I can see that you could do that adequately - I doubt most people would behave any differently.
The above is based in part on having tried (practice) emergency stops and manouevres in a car with the ABS active and with it disabled.
I am less enamoured with stability control and, particularly, traction control as the thought processes and skill required where they will be of benefit are usually different, although, given the level of attention given to the task of driving by most (particularly non-enthusiast) people, they are worth having too.