First look for one that is ice fishing specific. They are have flasher and battery in a portable package.
I don't have a specific model to recommend, but a couple of brands to look at is Marcum, Vexilar, and Humminbird. Each have a models to fit different budgets. Usually the ones above entry level are better or have more features all the way up to LCD screens and cameras.
I would think that now ice fishing is over one could find some good deals on them.