I'm a big fan of the simple matt lam - which everyone but everyone sells for £50 or so for 500.... I've had people ask me for metal (how pretentious?), wood (!), plastic, and just about everything else under the sun. At the end of the day, it's something that you exchange, glance at, and use to start the meeting. As long as it has the right details on it and looks presentable that should be enough! (Unless you're this guy:
YouTube - American Psycho: Business Card Scene)
Spot UV will, I think, be the next big thing, but not until someone works out how to do it cheaper! Best I can sell at is £100 for 500 at the moment...