There are very few anime that I think have good dubs. Big O's and Cowboy Bebop's seemed fine, but then I can't compare them with the original Japanese until I see the original Japanese. Currently the only dubs I cared for are Lupin the 3rd (the voices seemed at least fairly similar sounding to the originals, and they were just very funny, especially Zenigata), Trigun (pretty good voices in comparison to the originals, especially Vash. The lines also seemed well translated. It did a good job of capturing both the seriousness and the humor of the show), and Howl's Moving Castle (very good voices, though Billy Crystal's Calcifer took some getting used to (too low pitched compared to the loveable Japanese voice (the same voice for the frog of Sen to Chihiro no Kamikakushi (Spirited Away) in fact, so if you've seen Sen to Chihiro subbed, you pretty much know what the Japanese Calcifer sounds like
).
Just wait until Crossdive sees this thread (if he does). He'll be SURE to vote Inuyasha, or for that matter any dub he's seen with Richard Cox in it.