I've always been happy with Yuasa batteries, but this last time I decided to try a Chrome Pro. It's only been a couple months now, but it's worked flawlessly, has had no trouble on the couple 30F mornings already, and has an 18-month warranty for a great price. Plus, the one I got has a digital voltmeter built right on top of it, which is just cool & easier than hooking up test equipment when you're concerned about your charging system.