Isolation, a dark navy suit looks awesome on anyone. I also have another suggestion for your purposes: as you're having the suit made and it can be anything you want, then get a three piece. A simple, classic two button navy suit is quite understated without the waistcoat, but in all its three piece glory it is bad as hell. I like the DB just fine, but I think this might be more useful to you.
Also, have you though of a chalk stripe? On a very dark navy or any kind of grey, it's fiercely business but makes a louder bang than the navy solid, and as a three piece, will definitely get your "bad mutha" image going at the table.