I recently had a visitor to my website ask this question and I would like to get some suggestions as to how you would answer this.

Here is one site.
www.centaurfloors.com/assets/PDFs/IsoEcoAS.pdf

Hope the homeowner has patience & money.
Below Grade? Additional 30%

Art

There are other sports floor systems available besides wood. But if the homeowner wants wood, check this out:
http://www.actionfloors.com/floorsystemsandpads.html

As Art says, it will be expensive.

Gary, how do you think a Junker's clip floor would hold up to this test?

It isn't designed as a "sports floor system". Meaning, the reflex and bounce of the sysytem wasn't taken in to consideration in the design. Sports floors are designed to help prevent injury to the players. You'll notice many of Action's systems are cushioned and designed with a bounce to them. This is not to say that a floater wouldn't work. It may if done right. Also, Junkers is prefinished with small grooves. Sports systems try to avoid grooves in the floors because it makes it difficult to remove excess moisture. What you don't see in a televised basketball game is the floor maintainence crews mopping up the sweat from the players. Kinda hard to do with bevels.

Why not just glue down a maple engineered floor to the concrete?