I'll just throw this in to spice things up and offer another perspective.
The biggest key to fat loss is diet; the body is very efficient....it's easier to diet the weight off them exercise it off, but that's NOT to suggest exercise isn't critcially important...it's just to stress that more then anything the diet is the key. I myself felt I wasn't getting the results I should have been seeing...when I really truly put my intake under the microscope, my intake was higher then I thought...those calories stack-up REALLY fast and most people's hesitation in keeping a food-journal is due to their really not wanting to see/know the truth. Less food = less fat:
live it, learn it, burn it! 
Exercise is important because:
1) It's good for our circulatory, respiratory, cardiovascular and just about every system we have in our bodies! It is the fountain of youth...
2) It burns calories as we do it and added muscle continues to burn calories even as we sit idle....
3) When we diet, it's said that nearly 1/3 of our "loss" comes from lean muscle...the body seeks to lighten our caloric needs as a preservation response and adjust to the lower intake. By placing a nominal load (use) on our muscles, we are telling our bodies that we can't spare the lean muscle and so we maintain our muscle-mass. It falls into the category of "use it or lose it".
You probalby lost a lot of lean muscle while on Atkins, that and a lot of glycogen & the associated 3:1 ratio of water required to keep that glycogen. Your "gain" after deviating from Atkins probably wasn't entirely fat, it was your body replenishing and adjusting to the increased caloric intake....BUt at least you're on the right path now!
Exercise and proper diet is the RIGHT way to lose fat and be healthy....avoid "secret proportion" diets and fads of the sort.
Oh yeah
4) Chicks dig muscles
....rumor has it some even Love Muscles and profess accordingly...but those wild chicks are up in Canada so ya know, anything goes!
So as for legs...I don't do 'em, or I just get a bit with my trainer cause she's an evil b!tch who likes to work me hard and she, amongst other things, has a thing for legs. But before her, I didn't bother. I spin, bike and play racquetball....that cardio was more then enough to build huge calves n' quads. Lots of guys, particuarly those who were formerly heavy, have big legs and from the sound of it, you're running my path in the same manner. So I say, if your legs are already big, nicely shaped and powerful....then I'd rather see you spend more time on other parts of your body or doing some cardio. So if you're looking for a 'pass' on legs, there's your legit rationalization.
And hey, congrats on your progress!!!
