battery

Hey, I am looking for some advice on a good battery to get; preferably a tough one since I live in chicago. Right now, the highs are at 15 degrees, and whenever the car, my 1989 firebird, sits in the cold, I have trouble starting it the next morning, so I was wondering what a good battery to get would be

thanks

Interstate batteries are pretty tough. Sears' Die Hard batteries have good warranties in that they'll give you another one no questions asked no matter how many times it keeps failing. Implying that they wont give you crap or deduct money from it after 6 months. The Optima batteries I have heard are good but have never had one myself to vouch for it.