I have several screamin' yellow Brooks Nightlife tops and jackets---very high-viz! For summer, I have sleeveless and short-sleeved neon yellow jerseys by Terry.

This is the short-sleeved version: http://www.teamestrogen.com/prodTY_630024_0.html.

I saw a jersey somewhere recently that combined high-viz yellow with a neon pink. Great combo! Wish I could remember where I spotted it.