I had the same choice to make... they had a Yellow 09, Raven 10, and a blue 09 all for the same price. My first instinct was to get black... but as I was sitting on it, I had a flashback of a few weeks ago when I was driving home... I saw a black bike.. with a blacked out rider (black helmet / jacket)... and what REALLY bothered me... I couldn't see him at all. All I saw was the faint glow of his tail lights.... that made me look toward yellow. I know that it won't make EVERYONE see me, but it is definitely more visible than black at night. My jacket has reflective piping that shows up well even during the day...
The other day, I was riding in front of my wife... and she said she could easily see my bike turning up the street from 1/4 mile away...
I plan to get some neon / led's to light up my bike, too...