If you can get it to grow in your area Western Red Alder is a great wood to try. Its a great nitrogen fixer for later woodlot trees, it's growth rate is extremely high, it's proportion of useable wood is high, it responds well to fairly dense planting, works well and hardens up nicely when properly dried. BTU content isn't as high as maple for firewood, but you can't have everything. Its also really coming into demand for furniture carcass wood.
When I was younger we used to use it only for firewood and it was considered to be a weed tree. Nice to see some of it used for better purposes now. What really turned me on to it was a forester friend who found out I had gone down to Uruguay to look at eucalyptus growth rates and told me that we got better from alder right here in B.C. When I learned last year that some people were now trying it out for flooring I really got interested.
That's the beauty of wood. It will always surprise you!