There are very few that centre on 'The Troubles' themselves but having served in Northern Ireland during the 80's I too enjoyed watching films/programmes about it as it is a place I enjoyed so much.
Harry's Game (TV series) was set in Northern Ireland, unsure if the DVD is available though, need to check.
http://en.wikipedia.org/wiki/Harry%27s_Game
A Prayer For The Dying (Mickey Rourke, Liam Neeson) is about an IRA gunman trying to escape his past.
http://en.wikipedia.o..._Prayer_for_the_Dying
One really good one is called Angel, starring Stephen Rea.
http://en.wikipedia.o...Angel_%281982_film%29
Same actor in The Crying Game.
http://en.wikipedia.org/wiki/The_Crying_Game.
This too was made into a TV programme and was very realistic, unsure if it's available on DVD though. Possibly available to watch on youTube:
http://www.screenonli.../id/439385/index.html
Hope those are of some interest to you.