Personally, I like the 1st rack (the Bello). It is more minimalist, and I dig the styling. I don't like glass racks, as they dust seems to be more noticeable on glass than wood or metal. Also, no matter what, it seems like glass always gets scratched.
The last one is a Salamander, which is a very respected brand (and probably why it is the most expensive), however I don't really care for the 4 post design.
As always though, furniture is very subjective, and thus so is my opinion.