Done. Take a look at http://www.mrandmrssmith.com/ - I've used them a few times for special occasions.

Their model (for members) is to assume that you are going for a special occasion, so they tell you what extras you can expect.

I like your idea to do it the other way around, so you find out what I want then get hotels to put together an offer tailored to me. Feels like I may get a better deal that way.