Oz really doesn't get mentioned often when discussing the best of TV or even HBO. A shame, too, because it's brilliant television - storytelling flaws aside and some genuinely woeful writing, it played quite the pioneering role in terms of where a television show can go. At its best, very few could match it.
Mother and Son is another one too. Hidden suburban Aussie sitcom, but impeccably written and quite satirical.
Your choices?