I have never really spent much time on the Software Defined Radio arena, but the more I keep loo at them they are becoming so interesting. The CommRadio CR-1a communications receiver is a true SDR (software defined radio), but does not require a computer. Enjoy the benefits and performance of state-of-the-art SDR, but in a conventional radio package.
As much as I hate to say, it might be time for me to make a purchase and spend some time playing with these. I really like the size of the rig in comparison to the SunSDR2 (http://nicktoday.com/sunsdr2-sunsdr-mb1-transceivers-software-defined-radios/). Hard to tell until I see them both in person.