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The dual band adapter (DWA-160) will give you access to the 5.0Ghz radio band, which has a lot less interference from other "radio" type devices. The 2.4Ghz radio band gets a lot of interference from cordless phones, Bluetooth, microwaves and most other single band routers.
I don't see the point of the dual-band, especially when the range is absolutely atrocious on this router. Unless if you plan to use it in the same room, no need for the 5Ghz. So it depends on your usage.I'm looking for range, and I think I'll have to go to the 655 if it makes the N work better and further.