Advice on covering basement floor?

[Acer]

Good old 12" tiles are pretty cheap and easy to put down. Kinda fun, too, once you get started. The glue will work over old, dried adhesive from previous flooring--no need to remove.

My BIL put down those 2' x 2' plywood top, plastic-bottomed tiles, then carpeting over that and really liked the results. Pricey, though.