Good choice C. I think that I would go with a Colorado Blue Spruce.
Lilac. Love the smell
.....Good Golly........Buddleia 'Miss Molly' Butterfly bush.
https://www.provenwinners.com/plants/buddleia/miss-molly-butterfly-bush-buddleia-x
And it's non invasive due to sterile seeds......Good Golly........
If there's one plant and only one , shrub or tree