Metal windows are unique in that they are equally at home in residential and commercial architecture, modern structures and old-world historic buildings. They have a timeless minimalist profile, derived from the strength of the frames, which affords narrow sight lines even in very large windows.
In the Rustic Modern house, we installed the Bonelli windows you see below. These are black anodized aluminum frames with satin nickel hardware. The durable anodized frames require no maintenance, look great, and are locally made to boot!
Hope's Steel Windows and Doors out of Jamestown, NY, Torrence Steel Window Company out of Torrance, CA, or Crittall Windows Ltd. You'll need to go through a local distributor.
For aluminum windows and doors, you can order directly from the manufacturer. Blomberg Window Systems out of Sacramento, CA has great shop drawings and customer service. Bonelli Windows and Doors made the lovely units you see on this post. They're out of South San Francisco. They don't do shop drawings, but offer very competitive pricing, have a library of standard details, and will build to alignments you submit. Although I haven't used them, I've heard nothing but good things about Fleetwood Windows and Doors in Corona, CA. They have been serving contractors and homeowners since 1962. What other manufacturers do you guys like? If you have a local vendor you love, send them a shout out!