Impossible to tell from that sort of distance :-) There are some 700-800 registered cultivars of Japanese maples around and many with only the subtlest of distinctions. There are also countless seedling forms and these have no significant distinctions - they can be in a range of sizes, habits, leaf shapes and colors.

There are probably several dozen named cultivars that fit the general characteristics of your photos/description and any Oregon nursery is a good place to find them. Fall color is only one facet of a JM's attraction - spring color is also often a very strong characteristic. Take note of these trees when they leaf out in spring for any distinctive coloring or patterning. That can help you narrow down the list :-)

FWIW, most generic Acer palmatum seedlings make especially nice little trees. I would not discount hunting for a seedling under these trees and growing it on - you could wind up with a great tree for no money!!

Thanks for the suggestions and information. I'll keep hunting.

-Nick

There is a chart on this site that might help you narrow it down by leaf type, height, color, etc.

Here is a link that might be useful: Japanese Maple Chart

Threadleaf Japanese Maple 'Seiryu' (Acer palmatum var. dissectum)???

Here is a link that might be useful: seiryu