How can you choose?! I love them all. Except brown. I don't like brown. ...And maybe that kind of dull, sickly, greenish-tan color that some government buildings appear to be, that one isn't so great either.
I can't really pinpoint a favorite color. Much of it on factors such as the shade or the brightness. I tend to prefer brighter to more muted but there are exceptions. It also depends on the context and the mood. A color I may not normally prefer by itself can look great if combined with the right colors. That said, I tend to be drawn to teals, magentas, royal blues, bright reds.
5w6 or 9w1 sp/so/sx, I think