There's an Atkins area (Low Carb section) under Diet Central. Definitely check it out!
Trying to lose 3-4 lbs a week may be realistic in the beginning, but may not work out long term. It gets harder to lose weight as we near our goals. And what if you were to not make your goal by September or October? What if it took a whole year? It doesn't matter how long it takes, as long as you're eating healthy, exercising, and taking care of yourself along the way. It's more important to keep the weight off forever than to take it off quickly to begin with.
Focus on being healthier. The weight will come off in time.
Best of success!!!