I agree with Dunster regarding Pergo. We had it installed in the bedrooms, living and dining room last year and love it. All other areas are tiled--not one scrap of carpet, just area rugs. But we live in Texas where cold floors aren't so much of an issue.
I do like the suggestion of painted concrete. It's already there and I would think it would be more economical to hire professionals to do it rather than replacing it with something else.