This one is simply called "Strange"
http://www.imdb.com/title/tt0312209/
http://www.tvtome.com/Strange/
This was a british series starring Richard Coyle (from the British "Coupling") and directed by Joe Ahearne (the man responsable for Ultraviolet). Its about a Demon hunter, and it looks like there was only 6 episodes. I think on TV Tome it says it started showing on Showtime Beyond last february in the States.