I have a 120GB, and it does me just fine. Thing is, I only play games on mine. How much memory you get depends on whether you will use it for videos, photos, music and the like. I have had mine for 5 months, and have no end of DLC and installed data for my games, and I'm only about quarter of the way throught the memory.

So, the way I see it, it depends on what you used it for.