Most affordable residential metal windows for a modern design

I am moonlighting and designing a modern home in salt lake city utah and was wondering what is the most affordable residential metal windows for a modern design? My budget is somewhat limited so I want to try and find something that is affordable yet still provides a thermal break.

Thanks in advance!

I don't really have a preference to whether they are steel or aluminum. Of course aluminum would be great due to the low maintenance if I got an anodized finish, but if steel is a lot cheaper than I would probably go with steel.

As for storefront or residential, I am open to whatever. I have just heard horror stories of quality control with stick built storefront systems in a residential setting.

Aluminum, thermally broken, nail-on. Steel will be very expensive and probably won't meet energy code. A commercial aluminum storefront will also be expensive.

Thanks gwharton and gruen.

I am thinking that we might try and use storefront the one concern is the warranty, any ideas on any commercial storefront companies that will warranty a residential project?

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