Most professional doesn't mean best looking. Personally,I think red is the best looking, and also like the yellow, but agree that black and grey look much more professional.
Hmm. I disagree. When I had my red BB8830, I would get compliments & nods of approval in every business meeting I attended. I'm tired of black cell phones, and white does nothing for me.
I'm gonna go red or yellow. Cyan will be considered if offered.