I've got HotelPool.co.uk on my portfolio thread, considerably under your budget. Comes with .uk rights.
There's some considerable overlap for top-end hotels with spa facilities; obviously you do get some skanky hotels with skanky pools, and hotels trumpeting a "spa" with no wet facilities, but then that's where a review site helps!
As for exact match, I expect people usually add a place name to their search, but I think hotel and pool do go together in searches quite often. You can do your own research on that.
It's certainly high on my list of "sites to develop when I have time"; if you have a girl with time then get in touch!