You may think there is a huge difference in price between the hotels but day by day and even hour by there can be a very big price in any one hotel - commonly jump up and down in price.

Often the final choice can be based on the status-level you carry with the hotels and what you get / what they can possibly offer in return. There's nothing quite like paying for the most dingy-est of rooms for 10,000 yen knowing you'll probably get the suite in a different building (Kyoto Miyako until I suppose you do actually get the dingy-est of rooms ).

Hotel Prices here , like everywhere, are fast on the increase but a couple
of the hotels the OP mentioned are not worthy of 5 (or 3) star status - and you'll probably be disappointed - price is not always the best guide either - so worth doing lots of research into room size/location and general ambiance.

For me the Westin is a very nice hotel in a very nice area - especially at 30K inclusive that it can often be picked up at and is by a long, long way the best Starwood offering in Tokyo.

BUT - I will say if you are into "hotels" then you can't go far wrong with the Park Hyatt at 48,000 especially if that includes tax and service charge. A fantastic hotel - there's something very special about it and I can't tell you what it is, there's just something.