We have two brands - Clipper, SOMA's brand, and Silver, our brand, which is what we use on 90% of the bikes we build up.
The Clippers don't have as nice of a finish and have a hidden fifth bolt that's annoying when it comes time to change chainrings, but they're a great value.
All cranks listed are compatible up to 10 speeds.
If all this is confusing to you, just get the Silver 38/24 wide/low double. That one has a good enough range for almost everybody and you'll get a handy chainring guard too.
Here's a gear inch calculator chart.