I highly recommend The Paleo Diet with a little tweaking. I add a very small amount of cooked Steel Cut Oats and some Greek yogurt that is not on the plan. Paleo mainly consists of the leanest protein, fruit, vegetables, seeds, nuts and the healthy oils. It is restrictive, but very worthwhile. The book I have is by Dr. Loren Cordain. He seems to me the better expert.
I don't agree that you can eat as much as you like. If you go beyond your calorie intake you will gain weight. A pound is a pound is a pound. Also since you will be eating a lot of protein the body dosen't seem to be as hungry and three portioned size meals (you will have to figure that out) a day is sufficient.
As you can see on my slider, I started eating this way in January and now have lost 33 pounds.
What ever you decide, put your whole heart into it and work very hard on exercising, find motivation where ever you can find it. If you haven't already, join in a forum group. There really is no other way and never ever give up.
Cheering you on! Keep us in the loop on how you are doing. There are a lot of knowledgeable wonderful ladies here that will help with motivation and advice.
Janie