I used to be solely a japanese dub watcher, until I realized that watching anime in english can be fun, too. I just don't find it as fulfilling when I'm sticking to one language, even if I love the first set of voices I heard.
A prime example is Ah! My Goddess: I used to think that no one could ever match Inoue Kikuko's Belldandy, until I heard Juliet Cesario in the OVAs and fell in love all over again. Now with every release of Ah! My Goddess (except for Mini Goddess, which I have yet to watch), I watch it in every way I can. Same goes for just about every anime series I pick up.
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Current Avatar: Honami Takase Ambler - Rental Magica