Gundam Wing

This series is tremendously popular, but it's not an all-time favorite for me. I mostly have these cels because I like the character designs, and I still pick up a GW cel from time to time.

GW is heavy on Mecha combat, which tends to leave me cold, but it is very well plotted and is unusual for anime in that it has a number of strong female characters. The Gundam shows are also impressive because their conflicts often have more than two sides, and there is plenty of ambiguity about who "the good guys" are.