I can't imagine a better experience in putting in new hardwood floors. Bruce and Kai guided us every step of the way. We're so happy we followed their recommendation and had our eucalyptus flooring finished on-site.
They are so knowledgeable and their work of the highest caliber. And incredibly nice men. Kai answered innumerable questions from us, and did helpful research. We actually were all learning about eucalyptus, as Kai had previously worked very little with this rarely-used flooring wood.
By the way, we decided to incur the cost of new registers that are eucalyptus, and custom-made so they are sanded flush with the rest of the floor. Looks VERY sharp, so we'd suggest you consider if that might fit into your budget.
Anyway, if you want to work with nice guys who give you a gorgeous floor at competitive prices (with very very little dust generated in your house) -- I strongly recommend Bruce and Kai Joslyn of Select Hardwood.