The Excel Saga dubbers did an awesome job of keeping up with their Japanese counterparts in my opinion. Well, except for Jessica Calvello destroying her own vocal chords and having to be replaced halfway through, but that was the fault of ADV's DVD release schedule, not hers.
Is that really what happened? Because I wondered what happened to her voice on that show.
Also, as much as I hate to admit it (HATE! HATE!) I've enjoyed what I've seen of Onepiece so far and the Naruto manga is pretty damn good in my opinion.
Plus, OP has evil subliminal messages in it so yeah, it's fucking awesome.
Neon Genesis Evangelion Platinum
Trigun
Cowboy Bebop
Big O
Azumanga Daioh (Thank you stoke and girlfriend)
Full Metal Alchemist
Full Metal Panic!
Outlaw Star
Chrono Crusade (I never finished it. Some dickhead magazine spoiled it for me. ARGH)
Excel Saga
and what I listed above.