If you have only one of each, I would say enjoy them now. Not all at once, but decant one for a couple of days and savor it, assuming it's still drinkable (you don't say how it was stored or anything). Invite a few friends over, grab a recent vintage of whatever it is you are sharing that night, and compare what a difference the years makes, good or bad.

If you have multiple bottles of each, I would set a baseline now by having one. Then following the recent advice of Todd Anderson, every six months have another one. If after six months it's better then it was six months ago, put it back in the cellar till the next six months go by.

If it's the same or if the flavor is starting to faulter, then invite all your friends over and have a party with what's left and know you are drinking it very close to it's peak.

I would not look up the prices if I were you if you are going to drink them. Don't let the value keep you from enjoying it saying hey, it's worth that much, maybe I should hold it or sell it. I think expensive wine is best drunk when you open the wrong bottle by mistake and don't realize the value of it.