The Buck 110 is one of the most famous and popular knives of all time.
It has it's advantages (the knife is beautiful, strong and has good lockup) and also disadvantages (relatively heavy and has pretty stiff 2 hand opening).
There were versions of a D/A automatic 110, but they were made by aftermarket masters and didn't always have great quality.
The Chinese have made a knife that was built like a D/A knife from the start and has great quality, snappy opening and good lockup. I know that, because I have a similar knife (without the decorations) in my collection and it is one of my favorite knives.
The knife can be found here: http://goo.gl/96yNBD