Is Monster dubbed by Funimation?http://myanimelist.net/topanime.php
My rec's if you want a long series with a great story:
Monster (drama/horror series with one of the most amazing stories captured in animation. took 5 years before this masterpiece was dubbed in English), Legend of the Galactic Heroes (old space-drama series, large cast can be overwhelming, but amazing once you get into it. still has not been dubbed in English), Hajime no Ippo (boxing anime with a couple specials in between two seasons. dubbed) ... Gintama is supposed to be really good too.