Darrin Drader
Explorer
The Alternity version of Gamma World is pretty good also. It was done as a standalone book, everything you needed, and it was the only book done. I have it in storage so don't have it on hand, but if memory serves it shrunk the map down to just Wisconsin, leaving the rest of the country and world up for grabs. You might look for it and give it a try.
Actually it was the Seattle area. I always thought it was cool because it detailed places that I would see pretty regularly.