I don't have any suggestions, all the aftermarket sunshade products I've seen pretty much suck. When my son was still in an infant carseat (he's in a convertible carseat now), sometimes if the sun was really glaring, I would just adjust the canopy so it would cover more of his face. We started out with a Graco Snugride, but because he was a preemie, we needed a seat with a 4lb minimum (Graco is 5lb min.) before they would release him from the hospital, so we went out and bought a Chicco Keyfit - and both seats had adjustable canopies.
I always felt the factory tint was good enough, and if the sun was in his eyes for a few minutes, my son would just sneeze a couple of times and close his eyes. Unless you're driving in a straight line for a LOONG time, as the road curves and you make turns, the sun will hit other areas of the vehicle.
I've got a direct East-West commute and found the static cling window shades were useless for my baby (who was just moved up to a convertible seat that doesn't have a sunshade canopy). I'm getting the windows tinted darker. FYI, I read the roller shades are unsafe (projectiles in a crash).
I know this is off topic, but I saw her avitar...Alexandra, you here about D-Wade? That thing was a freak injury and now maybe out six weeks? It's too bad...he carried my fantasy bball team to the championship last year!!