BKK Hotel?

Now we have booked our flights we arew trying to make a decision on where to stay during our business trip - We need to stay on Sukhumvit due to meeting etc so have narrowed down to the following - The Westin / The Millennium / The Sheraton + the Landmark - All the rates are not a million miles from each other for club floor deluxe rooms but if anybody could maybe let us know wher they would suggest is the best of these ones (or if thay have another ideas) it would be great - Thanks