I don't think you understood KIXman's point about Narita.
Even if you believe you're saving money on accommodation there, the costs of commuting to and from Tokyo are considerable. And on such a short trip, you would spend far too many hours on a boring route.
Yes, plenty. Here's rjh's Hotel map which some of us have been keeping updated.
We all know you don't have to stay in Ginza

Best of luck with spending $50 a night each on hotels, keeping Tokyo in your itinerary and sticking to your budget!