If you don't really care about navigation, get a watch. It will do everything you want and be much more useful in other parts of your life. If you plan on getting a Varia in the future, it will need to be a Garmin watch unless you plan on running the Varia through a phone app. A watch is not as bike sexy as a dedicated bike computer, but it will work for you.
https://www.bicycling.com/bikes-gear...armin-watches/