Honda has this feature I don't like called LaneWatch, which uses a camera on the right side mirror to give live video of what is in your blindspot. You have to look on the touchscreen rather than a simple light on the side mirror that tells you "YES" or "NO." I much prefer the lights on BOTH side of the car than a one sided camera. The Civic is a great car though.
The first car I would recommend is the 2017 VW Golf in the Wolfsberg trim. Standard features in this trim include heated side mirrors with turn signals, a panoramic sunroof (which helps A LOT with car sickness), rain sensing automatic windshield wipers, automatic headlights, 1 12V outlet in front and 1 in the rear seats, leatherette seats, partial power front seats both driver and passenger, cooled glovebox, bluetooth, backup camera, USB port, VW App-Connect, blind spot monitoring, rear AC vents, and automatic emergency braking. I drove a 2017 GTI and I thought it felt really solid. It's definitely more solid than all the other compact cars. All for $23500. That sounds like a good deal. The Golf has been mechanically reliable.
You could look at a Honda Accord, Toyota Camry, or Kia Optima, but those will not have as many features at the Golf's price.
There aren't many cheap cars that have rear seat vents.