Make sure you have 2 locks - perhaps a shackle lock (needs a hammer to break it) and a cable lock (needs a saw to cut it). Most bike thieves won't carry both. Lock both wheels and the frame to something solid. Also, perhaps reduce the bling look to something ordinary.
For more advice post here:
http://www.boards.ie/vbulletin/forumdisplay.php?f=410