I'll just chime in on my moustache bars, since they were mentioned earlier. One thing I've found with these on my fixed conversion are that they're kind of wide--especially if you're ever in crowded places, like, oh, I don't know--Manhattan! They just seem to get in the way a lot when I'm not on the bike. And if you're using a brake, which I do, putting that sucker on and getting it right with wrapping grip tape took waaaaay too long. Bullhorns seem most practical, but I personally find them kind of anti-aesthetic. All personal taste, really.