If you read everything offered for free by Kurt Harris and Stephen Guyenet, I would recommend none of your listed e-books. If anything, maybe Robb Wolf's book or one of the anthropology books listed by various paleo bloggers (Melissa has a great list on her blog).

Kurt and Stephen are originators of fresh ways at looking at paleo stuff, and I personally would not pay to see those things repackaged. Plus there are so many great paleo recipe sites, that I sort of regret buying Sisson's cookbook (only sort of, because he's a nice guy to support).

If you want free e-books, there's a few of them floating around. A paleohacker med student, who's name I forgot, had a good one a while back. Here is the link:

http://www.scribd.com/doc/38453589/Beyond-the-Paleo-Diet

Hey there- if you guys want a free preview of my eBook (Balanced Bites) here is a link: http://www.practicalpaleoguide.com/resources/PracticalPaleoPreview.pdf

The main site for it is: http://www.practicalpaleoguide.com/

Let me know if you have any questions- the Table of Contents is in that preview.

I would get The Perfect Health Diet by Jaminet/Jaminet. It's better than the 3 you listed, IMO, and better than Robb Wolf's book as well.

I am a fan of the Whole9 folks, but I bought their ebook and I kinda wish I didn't :( It was a good package of info and I think I'm going to give it to one of my girlfriends who is starting out. I don't think it really had anything I couldn't have found on the net; maybe it was just meant for newbier paleos. Good info, but not too useful for me, and if you've already gotten a few other books, you may not benefit from it either.

The Paleo Solution by Robb Wolf. It includes a 4 week meal plan with recipes.

I love, love, love, Well Fed by Melissa Joulwan. Her style works well for me: a weekend day to cook a bulk of the week's food, and then being able to morph that food into different types of meals (Thai, Mexican, etc) depending on your mood each evening when you get home from work. She lays out how to calculate how much food to buy, which is also quite helpful. See all the reviews on Amazon for more reasons to love it.

I also have Practical Paleo (by Balanced Bites' Diane Sanfilippo). It is a great book as well. Extremely thorough from why to eat (or not eat) foods. Eleven meal plans for a variety of conditions/lifestyles. Lots of recipes. My only complaint is that it does not seem practical to follow the meal plans for a single person, if you want to follow it exactly. the recipes make enough for 4-6 servings and figuring out how to adapt to make sure you have enough for the week seems complicated. That being said, the recipes look great. I have already made a number of them. I'm just not doing any of the plans at this time. PS This book is a designer's visual delight!