Having an estimated budget is a great first step, but if you're really serious about saving money, get serious about budgeting. Track your saving and spending just carefully as you track your food on SparkPeople. Determine your fixed and variable monthly expenses and try to save the rest!
Whenever I go to a restaurant that has a buffet, I ask to order off the menu. I've learned that I just don't have the willpower for a buffet, and I'm always trying to "eat my money's worth." I'm just as satisfied with a plate of my own.