Dual band, I like because all our laptops support it, and you can get more bandwidth because there's more spectrum at 5GHz. However, as I discovered with the D-Link box when it was brand new, sitting right next to it with my laptop, "dual band" is meaningless unless there are dedicated antennae for both frequencies. Otherwise, they're just trying to shove a 5GHz signal through a 2.4GHz-tuned antenna, and the results aren't pretty. That's why I specifically want "simultaneous dual-band."

As to channel settings, I've got everything set on automatic. Several of my neighbors also have routers in the 2.4GHz spectrum, so hard-coding the channels seems like a bad idea.