Dipping on Passenger side with passengers

Ragtopfury and Georgeh are spot on. I started doing some more checking and it looks like the passenger leaf spring is sagging. It's only about a half inch so I didn't notice it but I believe there's my problem.

I'm running an all stock 225 so I don't feel like I need high end springs. I'm going to get a set of standard springs from springsnthings for $185 and since I'm already doing that, I'm going to get a set of torsion bars from pst. I'm hearing good things about the 1.03 for this car. Anyone have any input on that?