Where material is the same (steel) and finish nearly so (satin or brushed nickel), as in the three fixtures below, it's mostly design and dimensions that you're paying for.
Sleek, solid, and sizable.
A modern take on the discontinued fixture at
right, this satin-nickel, five-arm number from Shades of Light is 27 inches in diameter. It also has a ceiling-mounted rod, a nice upgrade from the chain-link look. About $490; Shades of Light