Every Paleo kitchen needs the following items to give an extra helping hand.
1. Crock Pot
How else are you going to create that lovely batch of bone broth to heal your gut? Crock Pots are definitely making a come back in the kitchen especially with those eating Paleo. We consume large chunks of meat and slurp up bone broths but you can cook other items in there as well.
I personally own the Hamilton Beach 6-Quart. It's programmable and comes with a meat thermometer (which I rarely use)
2. Cast Iron Skillet
A well seasoned Iron Skillet is probably the most essential item used in the kitchen, at least for me. I cook pretty much everything in it. I tossed out my various teflon, calphalon, whatever other kind of -on coated cooking materials in favor of stainless and cast iron. It takes a little skill and care to get used to cooking on cast iron but is well worth it for the flavor imbued and the avoidance of harmful chemicals flaking off into your food. You also get the added bonus of adding iron to your meals.
I prefer Lodge as that was what we always used in my time as a Boy Scout. I now own and use for everything, the Deep 10.25" variety.