In the matter of hotel reservations I must defer to other experts who specialise in this sort of thing.
I have always been impressed with www.octopustravel.com as they have a "best price" guarantee, and www.discounthotels.co.uk may also be worth a look.
For a comprehensive and up-to-date review of what's available, have a look at:
http://www.tripadvisor.com/Hotels-g60763-New_York_City_New_York-Hotels.html