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I would work backwards and figure out what you can do abou the moistue. Do downspouts dump water right on the foundation or do they do what they are suppose to do which is move water downhill and at leadt 36" away.
Look into a sump pump at 48" deep
I think it is a good idea to deal with the cause of the moisure intrusion before figure how to cover it up
Agreed. Solve the moisture/humidity/condensation problem first, then afterward, choose the flooring. What are your goals? Hard surfaces that are unaffected by moisture are ideal, but possibly cold. There are floating floors that could be an option which will be slightly warmer in feeling. A good basement with proper drain tile, no moisture problems, proper dehumidification, and good HVAC can use carpet with little risk of problems.
"Best" is a relative term. There are certainly options that provide different levels of comfort at different price points. Recently, we've used a product called Thermal Dry from a company called Basment Systems that installs a over the concrete. It is a snap together PVC product (unaffected by moisture) that has a matte finish(for carpet) or a faux finish (like a wood appearance). This prevents direct transfer of moisture from concrete to carpet and provides a (minimal) insulation layer at the floor layer.
I am sure there are other simlar products on the market, but this one has served us well.
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