Upgrade to Rev C?

Dear Forum,

I bought a model A5A early last year as soon as I heard about the BBB, expecting to try out some awesome robotics projects. Unfortunately, my year was fairly busy and I was unable to utilize it too much. I am wanting, now, to try some Software Defined Radio projects with the BBB and GNU Radio or some other software, and am wondering whether it would be worth it to upgrade to the Rev C or if I can do this just fine with the Rev A. What are the pros/cons of Rev A vs Rev C outside of the extra 2GB of memory?

Any thoughts?

Thoughts on the Software Defined Radio bit are welcome as well.