Milliskin is MStevens name for the Lycra-like stretch fabric they make their tights from. If you've had them before and didn't like the shine, look elsewhere. Many people like the sleek, skintightness of MStevens for performance wear.
Baltogs cotton tights are probably the most opaque, but as you point out, aren't smooth and sleek, especially after a few washings. Baltogs nylon tights have the same sheen the MStevens tights do.
Capezio nylon tights don't shine at all, but are also the most see-thru. I think their waistbands are excessivly scratchy and they have to be really pulled up to eliminate bagginess in back of your knees.
I've heard good things about Sansha, but have never worn them myself, so am not qualified to comment.[/i]