ChristopherClegg All the models you mentioned should be good for the range you need, so check there.
I actually think the X7 Pro has pretty decent ride, even with only it’s air-filled tires.
The Touring will bit better but more subtle than you might imagine. Smaller tires (compared to the Ant) go against it a bit (as you noted) and the rear is actually solid. Suspension helps, but sounds like you might have some pretty bad roads. How effective the suspension is also depends somewhat on what type of bumps. I’ve been on some bike paths that had deep wavy bumps that suspension is less effective on.
Ride quality on the Touring is best of all you’ve mentioned, but largely because of deck size.
The Z8 and Horizon are built from the same frame with some small variations. Also have the split pneumatic front and rear solid configuration. Not as long on the deck space so less comfortable in that respect. Similar in terms of suspension, though I think many would prefer the Touring. Some of that comes down to personal preference just based on riding and hard to articulate.