Skywalker, please don't ever go back to hcg.
I've done that too, and you're right: if you don't have something healthy to go back to, you won't.
So I'm glad you came here looking for answers! Let's get to them.
If you want to do the slow carb diet and you haven't read Tim's book, you really should. Here are a couple primer posts I've written to help folks like yourself just coming in:20 tools and tips for 4HB beginners4HB Food ListMaking It Easier to Stick to the Slow Carb Diet
Now, if you want to go more paleo or primal, you'll be doing almost exactly what the slow-carbers do, but instead of legumes you'll eat more veggies and occasionally fruit and tubers. The "rules" about dairy and grains are the same between all of them.
You can also download Mark Sisson's free ebook
, which also has the "rules" for a primal lifestyle.
I really recommend signing up for his newsletter (you need to to get the free stuff) because his email series teaches you why your diet should be this way. It's much more about good health than weight loss, but as Justin said, the weight loss will come.
In either case, you'll be able to enjoy popcorn at the movies.
Don't worry about buffing up yet. Focus first on getting lean and then work on getting stronger. As you do get lean, you'll also notice you're getting stronger, especially if you're doing the workouts you'll find in the book.
The biggest tip I can give you to start out is to not think of this as a way to lose weight, because if you use primal or SCD just to lose weight, once you do you'll go right back to your old habits and get fat again. You note that you're in good health; I would bet money that you are in even better health than you expected by sticking to these principles.
Good luck! Keep us posted.