We won't be using it for videos, photos etc; got plenty of other technology around the house to cater for that, so it's sole use will be a games machine. I also can't see us buying more than half a dozen or so games a year. I'm guessing the hard disk storage then will be used for game save files, patches and DLC. Have I missed anything?
So based on that and the inevitable budget contraints, what size console should I be considering?