Is space a concern? Is that why you are looking at an Aspen?
If you have some room, any Willow will grow very quickly and they are beautiful - especially the Goldens. They do prefer moist soil, so if this is a lower lying spot in your yard, it would be perfect.
If space is a concern then other thinner trees you could look at would be a columnar Mountain Ash or even an Amur Maple.
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