Finishing Basement Floor
I am no expert on basement floors, but I know a little, as I am an electric guru for Watts Radiant Suntouch (tech support, etc.)
Generally speaking, I rely on others for some specialized information, and when it comes to moisture in basements: Do not use wood!
Wood will soak up the water and rot, will not release it quickly, and the consensus is to not use it. Ditra might be a good base, as it is synthetic, and would allow space for the water to leach to, and there are synthetic products like Ditra specifically designed to create an air space between a damp or wet slab and finished flooring. The specific product names escape me at the moment, but some googling might yield the result you need.
As long as it is just a damp spot, hopefully that is all it will be, and french drains and sump pumps will not be in your future. This kind of thing surfaces from time to time in my business, and can be a real headache if not done correctly.