Don't get it aligned at the same time you get new tires or a balance job. Make sure they do not lift the car before aligning it. It takes up to 25 miles to get back down to ride height so your new alignment will be worthless. Even if they tell you they'll align it first then balance them, don't do it.
By the way, be careful at Firestone. A friend of mine used to own one and he said they taught them every way in the book to try and rip you off. Things like telling my wife we needed new brake pads and rotors, until I walked in and let them know I had just changed both the week before.