I picked some mods from my sub list trying to find entries at around 1000 subs on Steam Workshop, so unlikely to be on top 10 list cause they are mostly unknown. Prisoner Recreation is slightly more popular than that but I included it with Prison Commons cause I think functionality they provide should be included in base game/future DLC in some form. In no particular order:
Prisoner Recreation – useful in multiple scenarios. House arrests for rowdy colonists, keeping sanguophage bloodbags happy, giving prisoners you want to recruit a glimpse of life in your colony, having separate prisons for low and higher security prisoners etc. Also good for role play. Combine with Prison Commons.
Perspective Paths – gizmo for making floors with hard edges. Dunno how to explain it in writing, better to look at it yourself.
I skipped race, hair, furniture and other assets mods cause they are more of a personal preference. Same with less popular submods for bigger mods like Dubs Bad Hygiene. Hope this is of some use to you!