After a 20+ year break I began road biking again last October. I have a Cannondale Synapse similar to Zoom-Zoom.
I love it.
It was a toss-up between the Synapse Carbon 6 with Tiagra or the the Synapse 5 with 105s.
I went with the carbon frame since it would be kinder to my almost 50 year old body.
I don't mind the downgrade in components because the Tiagra has little windows that give you an idea of what gear you are in.
Mine is Egyptian Blue like Zoom-Zooms. For some reason the Carbon 6 doesn't look as pretty on the Cannondale website but it is that same vibrant blue as the 5.
You will enjoy riding with your DH. Mine got really serious about his riding about the same time I quit 20 years ago. Now, since he is stronger and rides longer than me, he goes out and hammers first and then comes home and we go out together for a more leisurely ride. This works great for us since we live in a rural area. We are so thankful to have this special time together.
It is great that you guys are getting into riding at the same time!