Silver birch are my other favourite trees. I love their delicateness and their ghostly bark. They look just as pretty in winter as they do in summer and autumn. I plan on planting quite a few of these around my house this winter.
I have a thing for oak trees. I grew up in a sub tropical climate where there were no oak trees. In Tasmania these huge oaks are all over the place. They are not native to Australia but the climate down here grows them well. There are usually a few possums living in them and often you will find a kids tree house perched in between their sturdy branches.