Dear Ms. M:
As much as I LOVE RED bags, for summer, I am going to vote for Chartreuse because it is a COOL color and kind of calming factor due to its hue.
I too think brighton blue is suitable for summer because it is kind of soothing color too for summer.
Since you have the GOLD already, BB would be good SUMMER bag that you can wear with some light color CLOTHING.
Pls. do let us know what you've decide?!