Car and Driver put some PIAA super plasma's in their long term Mercury Mountaineer. They said that they made a substantial improvement. I'm not sure about the Contour but I would assume similar results.
I'm running 4000k Plasma Xenon bulbs. I like them.
They are even a bit brighter then the Xenon Cool Blues I replaced (actually moved to the high beam slot as I run 4 9005 bulbs already)