You can abrade the epoxy you have now and top coat it if you like. You can buy filler if you have any substantial gouges. Just make sure it is not peeling or bubbling.
Here is the only one I have a picture of, I painted a Mercedes logo on top of the epoxy and then put some acrylic floor wax over the paint to protect it. It lasted for 3-4 years and then I painted over it after ditching my AMG.
These guys are friends of mine, try them for a lift, you can get them for all garage heights.
http://www.doehrman.com/