I don't know to be honest - the Caps seem to be in a worse mess than the Canes if you can believe it.
Sounds like you are merrily on your way to the playoffs - is there anyway you can pick up Vokoun and ride it out on Vokoun and Ward for a while to see who is performing better closer to the playoffs?
I would probably stick with Ward otherwise, but have no clear reason for that other than the Caps just are so dis-functional at the moment