In a climate like Las Vegas, I would be wary of using aluminum because of the frame performance. Aluminum is a wonderful conductor of heat! Have you considered fiberglass? You can achieve a contemporary profile with much better overall performance. Good luck.

Do a search, as there's an earlier thread on this subject.

IMO the coolest modern-looking windows come from Japan's Sankyo aluminum, their new View Art series, which comes in 9 foot tall height with slim 1 inch thick frames high performance frames, slim crescents, etc. Tres cool, and unfortunately not available to you.

Here is a link that might be useful: Sankyo's View Art modern aluminum window

Not exactly what you're looking for, but we're using Loewen windows for our modern house because one of their exterior options is clear anodized aluminum, and the frame isn't too fussy. The interior, however, is douglas fir (or mahogany for an upcharge) - which we're going to stain.

Much of our main floor has floor to ceiling glass, which we're accomplishing by placing 7' x 3' windows and sliding doors in a row, with 2' x 3' transoms above.