If i ever get to keep enough bottles long enough to actually develop a cellar, I will keep your suggestion in mind. Since I'm usually firmly in the $15-$30 price range recently, it doesn't matter all that much.

Also, the dots idea that cordelli suggested sounds a little less gauche than actually writing prices on the bottles. If nothing else, it could allow you to tell your house guests to "only open the bottles with green dots on them", especially if your guests were family members for whom you did not care very much.