Low carb diets can be healthy or not depending on what's included. Remember that vegetables are carbs, too, which is where Atkins when wrong -- not enough vegetables and their essential nutrients. Also keep in mind that there's no such thing as a Paleo diet, it's just a name -- as long as they've dug up our ancestors they've found chewed grains. But of course they were whole grains, not processed flours, and not all grains are created equal. Which is to say, there's a lot of room for experimentation out there for you, but be sure not to do a diet that doesn't include enough antioxidant and mineral rich foods, which is mostly vegetables and fruits.
The only other thing I can say is, be patient. My plateau lasted about a year, and had I given up, I would have had to start back at square one. It's better to "hold what you got" than it is to go back to gaining weight. Enjoy yourself and keep up the good work.
I like the paleo diet. My weight loss had stalled for a long time, and now I'm losing again on the paleo diet. There's a lot of information out there about the paleo diet, nowadays. A book called The Paleo Approach is a good introduction. I also like the PaleoMom website, and she also has a book that has just come out. Nom Nom Paleo is another good source. In effect, the paleo diet is a low-carb diet, because you don't eat any grains. The South Beach program also has a low-carb version of their diet. In my opinion, both the paleo diet and the low-carb version of the South Beach diet are low-carb diets that are very healthy. Good luck.