I got the all black and like how it looks. Not that I got it for this reason, but I got a lot of compliments on it (u mirin?).
Never understood the fear of having a steth get stolen. How does that happen? I suppose after hearing these stories prior to starting third year it made me vigilant of always keeping it on me. Even on surgery when it would be left in my white coat hanging somewhere, though, it would still be there when I got back. I'd recommend getting it engraved if you're worried about thievery. It'll cause someone to think twice before they take it if they see your name on it. Back in the day, Steele would do it for $15 or so - pretty cheap if you consider it an investment and tool for your training (less than $200 total for a new Cardiology III engraved = good deal IMO).