
Storing wine for long periods of time in Colorado can be a problem. Low humidity will dry out corks and ruin wine before you know it. If you've got that special bottle of wine stuffed in a closet somewhere, then you're probably asking for trouble in the long run.
Once I was up to about 100 bottles in the basement, I knew I had a limited amount of time to find some way to store it, since I'd probably passed the drinking stage at that point. Once you've got more than a few bottles, which you drink out and replace every few months, you need to start thinking about storage.
Ideally you should be looking for 55F and 50% - 70% humidity for long term storage, no light, and no vibration. The humidity helps the cork do it's job. UV light will ruin wine, and vibration is pretty iffy as well.
A wine cooler basically keeps wine at 55 or so. Look for either a solid door or a glass door that has a UV resistant coating. These can be inexpensive, but they don't control humidity. You can probably get about 6-12 months of storage out of a wine cooler.
A wine storage unit, like the
Eurocave show above, controls both temperature and humidity for long term (years) of storage. There are a number of units to choose from, and options as well. I have the 3-temp 260 (up to 260 bottles) in my house. I've been pretty happy with it.
It seemed a good compromise to building a cellar in the basement. I can't take the basement with me to the next house, and I probably won't outgrow the eurocave it for a while.
I already have a few bottles that I'd like to try in 30 years or so. One is the 2000 vintage grahams port. The other is the wine spectator wine of 2004 (100/100) 2001 Chateau Rieussec, 1er Grand Cru Classe, Sauternes, 750ml. Stuffing those in the closet for a few decades probably would result in a bit of disappointment in the end.