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I have found Interstate and NAPA United batteries to give yeoman service over the years at a very reasonable price.
The most important thing to look for in a battery is how fresh the battery may be. Interstate and NAPA rotate their stock on a very regular basis and you will rarely get a battery that has been sitting on the shelf for a long time.
Interstate batteries are the best but Wal-Mart's Everstart probably is your best bet cause they are generally open 24 hrs. If you are on a trip they will be the cheapest and quickest to replace but they will probably last half as long. But their warrenty will cover them . As a Rv tech i perfer Interstate batteries, the only car dealers that don't use them i GM cause they have their own brand AC DELCO.