I would go with 105 or ultegra. They are both high quality and long lasting if properly maintained. I am not a big fan of DA because they tend to experiment with it. If there is a problem then they simply redesign it.
The newest version of DA has an al. axle and what looks like a narrower freehub body. The internals such as the pawls will be smaller. I don't know if they are less durable or not.
Some of the after market brands have the freehub and cassette assembly, but they mount the right side bearings that support the axle inboard. This makes for a weeker hub.
http://www.sheldonbrown.com/brandt/free-k7.html