Dogpile on the varia radar. It interfaces with wahoo and garmin computers so if you have one no need for the display.
The Roubaix and Domane are good bikes for you to look at. They are almost as aero as the respective racy bikes from these companies, with a more friendly geometry and enough "suspension" to ease the chip seal. Pricey though. However, Trek travel has a great deal on lightly used Domane's from their rental fleet-
https://shop.trektravel.com/collections/road-bikes/products/trek-domane-sl-7-11-speed-di2-electronic-shifting-used
Ultegra electronic is a flat out excellent group now . These are rim brake. The disc bikes pop up from time to time. The major issue with rim brake bikes (all of mine are still rim) is that the industry is moving to wider rims and tires-25mm rim width with 28's and 30's now the norm- and rim brakes don't always accomodate these. The Domane should handle 28-30's no problem but on a slightly narrower rim.