Personally (and bucking the trend) I'd go for yellow. On a tour a couple of years ago my mucker had two tops, one yellow, one black. On long straights I was amazed just how much further ahead you could see him when he was wearing the yellow. Yes, OK you are always going to have people who aren't looking enough and could hit even if you had a flashing orange light but I'd say being visible from 800 yds is better protection than a helmet... oops...