I would plant forsythias mixed with butterfly bush, It would be sort of an informal planting but don't plan on trying to shear a viburnum.

I'd go for something smaller. I've only dealt with wild arrowwoods, but they are not small shrubs. You will have to prune them back to keep the path clear.

"Matures at 10-12' tall and 8-10' wide. . . . An extremely durable yet attractive plant but overlooked because of its ultimate size." Classic Viburnums

That's a quite large plant for a space that size. Even with pruning, anyone walking through that space will feel crowded and overwhelmed by being sandwiched between the shrubs and the house for 30', so I would choose a smaller plant. It is a huge amount of work to attempt to keep a large hedge small with a plant that grows vigorously.

Two other considerations:

There is an insect in my area, the Viburnum leaf beetle (Pyrrhalta viburni), that defoliated my one plant of V. dentatum, of which Chicago Lustre is one cultivar. You don't say where you are, but I know it's a problem in New England and in Michigan, so unless you are far from both, I'd avoid such a susceptible plant since invasive insects expand their range over time in most cases.

If you want berries, you will want more than one cultivar. Viburnums aren't self fertile, so they won't set berries if they are all one kind of V. dentatum.

Do you like the neighbor? Planting a tall wall seems inhospitable. Lower shrubs that you could chat over would be friendlier but maybe that bridge has already been crossed.

I'd ck if nursery has a sale on dwarf shrubs. I'm guessing you want shrubs to serve as natural fence? Personally, I kinda like the present spaciousness of the area

Growth over onto neighbor's side is probably going to be the basis for problems later. Even at the small size the shrubs are at now, who is going to be pruning them on their side? Do they want to be having to bother with this? And what if they move out later and somebody moves in who is less agreeable? Many property owners can be quite territorial, also do not appreciate or understand hobby gardening* - or even know how to tell a garden plant from weedy kinds. (For instance I've now got a climbing rose that has been ruined by a neighbor spraying herbicide on the parts of it that recently poked through the fence maybe a foot or so. This is not the first time they have done this kind of thing, so that even though the side of the fence facing me is right on the property line I will probably have to give up on trying to grow climbing plants against it).

If you want screening or separation in that comparatively narrow space you'd be a lot better off installing a wood fence yourself and then planting whatever you want on your side of it, having only of course to keep your plantings from reaching through or past the fence later - as I have to do here.

*By far the majority of Americans who find themselves in possession of or involved in the upkeep of garden plants are not gardeners

"By far the majority of Americans who find themselves in possession of or
involved in the upkeep of garden plants are not gardeners"

And they are the neighbors of those who are gardeners, leading to endless frustration on both sides.

Ok, definitely lots to consider I think, I am so glad I asked before impulse-shopping :(

I keep going back and forth with the idea of having a pathway in this side of the house, eventually placing an arch ( garden arbor) sort of thing, hubby flat told me no to anything climbing on the house, but he gave the ok to building something there... lots of dreams... I love this place, thank you all for all your input.

I might consider a wire fence with vines growing on it for flowers. Also look at what Woodyoak has done with her side yards. She has posted a lot of photos on this forum.