I suspect these maples COULD grow for you, but if you REALLY want diversity, I'd go for almost any Birch (especially our native river birch or one of the white barked kinds), or how about Larch? I think most any of these would thrive for you at Grand Lake and really look different. I was just in Tibet and saw dozens of broadleaf and coniferous tree species growing at 14,000-15,000 that would probably be reliable for you as well--just start with small, inexpensive ones and select for hardiness!