Looks like I'm going to stick with Ebo Jagers. I like Mike's idea of rotating them, though I can't promise I won't just let them rot away in my sump. I do use them on a controller with parameters.
With lighting, house heat, and ancillary pumps, keeping it warm hasn't really ever posed and issue for me. Now, in the summer time, I've certainly had issues with too much heat. There have been a couple of nail biter hot days in the past that warranted a "lights out"!