Mad Men!!! Mad Men!!!
The Tudors is great but pretty risque. We loved it. Rome is good but really violent. Breaking Bad is *FANTASTIC*. Some seasons of Dexter are very good. Arrested Development is one of the best comedy series in the history of television. Peep Show (BBC) is very adult but absolutely hilarious. Some more BBC: State of Play miniseries (don't get the US movie version), Life on Mars, cop show+some almost sci-fi elements, great stuff, but DO NOT get the US remake. Foyle's War is really excellent WWII-era police drama.
Hope that helps :)
Forgot to say -- we love Dancing with the Stars and can't wait for the new season! :)