You should watch CYEnthusiasm. It is really great. My favourite comedy. Glad you enjoyed The Wire as well, I think it is the best TV series ever made.
The Shield, albeit very good, is not the Wire. It is much more hollywood than the Wire, in terms of an episode will end with a suitable conclusion. You may have heard Simon Sebag Montefoire saying that the Wire has a 'better' political aspect than the West Wing, a 'better' gangster aspect than the Sopranos, and a 'better' police aspect than NYPD Blue and The Shield. So clearly, no matter what drama you watch now, nothing will live up to the Wire, but still, I do highly recommend the said shows in this paragraph.
ALSO, DEFINITELY get State of Play (BBC Series I take it? Not the 2009 remake for film?) You can get it on amazon for around £4 (when I bought it) and it is six 1-hour episodes of intensity. Very good. Worth every penny. Great acting.