Floor choice for walkout basement?

I have a full walkout basement where the front portion is entirely below grade and the back portion is entirely at grade level. The house is 45 years old and located near Chicago. I've owned it for 1+ years, and have noticed no water problems in the basement.
I've read a lot of information on this subject on the net, and I've talked to some salesman at flooring stores and home centers.
I've heard ceramic tile, carpet, and vinyl are good choices for the floor. I've heard hardwood is bad and that bamboo would be good.
I've heard that I need a subfloor built out of 2x2's, foam insulation, and sturdifloor plywood. I've heard I need a subfloor built out of pressure treated plywood glued directly to the concrete. I've heard that I need no subfloor and can just blue the engineered bamboo directly to the concrete.
I've heard that the floor should be glued down, nailed down, and I've heard it should be left floating.
Can anyone out there help me sort all of this out? I'm inclined to go with bamboo if it is appropriate for this project.
Thanks!
Scott
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Would cork flooring be a viable option for this basement? It may have some advantages in durability and installation and appearance.
Joe
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