A good place to find colored tights could actually be your local discount store. At my TJ Maxx and Daffy's store, I always find purple or burgundy tights in the discount bin. Once, I even found two pairs of red Wolford tights for $0.99
Online, I've bought tights the colored
E.G. smith tights from Sock-Dreams, but they seem to be out of stock on a lot of the colors. I've also seen them in Urban Outfitters in the past before. They are also available on
Socksmith, but I have never ordered anything from the site, so I can't personally vouch for it . . They are kind of expensive, but I really love them.
I've also bought the tights from
Stocking Girl, but I like my tights quite opaque, and they got runs in them quickly. But the color selection is really nice.
On the American Apparel tights, I'll agree about the waistband--I couldn't wait to get them off by the end of the day. I think maybe because they are very high-waisted?
I've also heard raves about Tabio . . . but as a sad stateside person, I don't have any experience with their wares.