I vote for fuschia, especially if you want to impress the chicks.
Or if you have kids, I would go for a separate color for each of the four boxes, say red/green on one side and blue/yellow on the other, kinda like a big Rubik's Cube just exploded in your living room.
Or better yet, talk Wilson into getting some of that $200/qt. metallic color-changing paint, then you don't have to decide at all but can just move your listening chair around the room based on your mood at the moment. Lessee, purple if I sit in the rear left corner, green if behind the right loudspeaker....