I think any of those look fine. Availability is the problem this year. I would point you at the salsa journeyman flat bar, which a couple years ago was not very expensive due to a mid year price drop and sold at REI, but I have no idea what the availability is like right now. Priority is a good mail order brand that prioritizes low maintenance in their designs. Diamondback, Polygon, and Canyon are some other brands to order. Most brands have a bike like these. There is a specialized Sirrus and the trek FX and the giant escape.

Better bikes are better, obviously. With a bike at this price level you might find after a thousand miles that some components are giving out that you would not have expected. The component materials are not as nice, being painted rather than plated, and seals are poorer. The build quality on the rear wheel is always a problem. But if you stick with this you are going to be willing to pay more for nicer stuff on the next go round and have some idea what you want and it will be OK.

If you are going on a gravel road in the winter remember that you need fenders and lights come November