Trying to decide on 5-leaf or 6-leaf Springs

I'm getting ready to order new leaf springs for my 66 Barracuda and I want to get your opinion on whether to go with 5-leaf or 6-leaf.

It's usually just me and the wife, we rarely have anyone riding in the back seat. And, I don't haul anything in it.

6-leaf springs cost $41 more shipped. What do you guys think? If I really don't need 6-leaf, I can spend that $41 on other parts.

Thanks!