I know there have been a couple of threads on cookware lately, but I wanted to get some feedback specifically about copper cookware. I've been looking at it lately, and it's all so beautiful -- and pricey. What is the advantage of copper over other things? I know it conducts heat well and evenly, but doesn't stainless steel also do that? So why spend the extra money (aside from how gorgeous it's going to look hanging in the kitchen)? Also, if I bought one or two copper pieces, what would you recommend that I buy? What is it best used for? And are there any brands to avoid?