I'd also recommend mixing up the species in the planting. Not just for aesthetics, but also provides a bit of a hedge (pun intended) against potential diseases or issues with the columnar aspen. You can mix in some Swedish aspens and perhaps even a columnar spruce or two.
Wouldn't recommend cedars - they're not fans of our climate. Some similar looking juniper species do well, but they're not making giant gorgeous hedgerows like the can in Vancouver.
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