Here are my favorite anime dubs:
R.O.D. the TV
Mobile Suit Gundam Seed
I also think Winx Club has an excellent dub, although that's not an anime...
In any case, I'm usually very open-minded about dubs, and there are only a few that I don't like. Being dubbed by the Ocean Group is usually a good prerequesite to be a dub I'll like.
Nice to meet you all!