I would recommend an engineered hardwood floor.

Its construction is laminated wood layers and has much better dimensional stabiltiy in regards to expansion and contraction from humidity and temperature.

In fact, it's dimensional stability can be nearly twice that of solid wood hardwood flooring.

Here are a few:

BR-111 Engineered:

http://flooringworld.org/floorsearch.php?query=br111+engineered+hardwood

Bruce Townsville Engineered Strip:

http://flooringworld.org/floorsearch.php?query=Bruce+Townsville+Engineered+hardwood

Harris-Tarkett Crossroads Distressed:

http://flooringworld.org/floorsearch.php?query=Harris-Tarkett+engineered+hardwood

Hartco Engineered:

http://flooringworld.org/floorsearch.php?query=Hartco+engineered+hardwood

Mohawk Engineered:

http://flooringworld.org/floorsearch.php?query=Mohawk+engineered+hardwood

Another important product is the hardwood adhesive itself. There are many varieties that create resistant layer and lower concrete vapor emissions.

The two best I know of are that deal with moisture vapor emossion concerns are:

Bostik:

http://www.bostik-us.com/products/index.asp?fa=subCategoryPages&divisionId=2&categoryId=2&subCategoryId=49&subCategoryPageId=31

Stauf:

http://www.stauf.info/a/ms.htm

http://www.stauf.info/a/wfa.htm

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