It's been awhile since I've looked at single board computers and wow have things changed. I just went to Amazon and looked at their single board computers rankings and the processing power and the cost factors are just so incredibly good now. It's amazing. I wish there was some good spreadsheet or website that gave a good indication of all the features of most of the sbcs out there now so it would be easier to choose one that's perfect for any particular project. I didn't notice that I didn't ever see a board with a five gigahertz Wi-Fi. I don't know if that's because of the form factor or if 5 gigahertz is just a lot more expensive to include.
This might give you a starting point:
https://linuxgizmos.com/catalog-of-136-open-spec-community-backed-linux-sbcs-under-200/
(post is archived)