I just looked up the chart for JCOM...reminded me of the thoughts I had about RMBS.
Certainly RMBS has made for a good long position repeatedly for the last year or so. When weakness in the momentum begins to signal, it will be a great short. Possible 25% (or more) could be gained on the short side if caught at the correct time. That's just my humble opinion, Zeev is the expert on RMBS though.