I like 4" but I liked 3.5" and couldn't go back to that. If it's thinner and not too bulky then I'd be okay with a larger phone. I used a 4.7" phone before and the only bonus was it was nicer for web browsing but I was conscious of it being too large.I guess. Do you want it to stay small or go big?
Thing is, if the C model has a 4" screen, but no 64GB version, it will be useless to me.The c model will have a 4" screen