I used the Rustoleum industrial floor coating in mine, and it's held up great for the 2.5 years since we built this house. It's not the same stuff as their garage floor coating, I remember when I got it that it was over twice as much. The only thing I would have done differently is to put it on a
LOT thicker. I had no idea that the new concrete would soak it up as much as it did. Think along the same lines as painting drywall with no primer, it just gets sucked into the floor. It didn't leave any gaps in coverage, but there are some areas on the floor that do not have the smooth epoxy finish, it's more like the surface of the concrete.
http://www.rustoleum.com/CBGProduct.asp?pid=14
Here's a pic showing the floor after it's done in the rear stall of my garage which is the bike lift and workbench area. PM me if you want to see larger, more detailed pics (there's a size limit on attachments here)