admittedly, i have not read but one Paleo book and i would like to purchase one that contains a sound comparison of a good neolithic diet vs. Paleo.
i bought a copy of the revised "The Paleo Diet" a couple of months back and was supremely pissed at the sample diet (pg. 32) Cordain used to tout why Paleo is the better choice. eating a cardboard box would be the superior choice to the Typical American Diet he used for comparison.
I was under-whelmed by it too. My favorite hands-down is Robb Wolf. In fact, you could forego the book and get everything you need from his podcasts, forums, and website. His quick start guides alone are gold.