Storage

Today I'm thinking about storage for my card collection. Currently, my cards sit in a tall closet with shelving in it, from Ikea. It works pretty well, but it was $10 from Craigslist and one of the legs is about ready to fall off. I'm wondering what everyone else does for storage. Do I use boxes and store them in a closet? Do I keep my collection where I can see it and display some items? What's best for the cards? I know I should keep them out of direct sunlight, protect them, etc. but what about temperature? Does that matter? We are starting to look at houses and there is a possibility I could have much more space for my collection...what should I do? Hmm...