I believe the B8 is a fair trade. You may never get your hands on another 1311 though. That is unless the fifteen guys that bought about twenty 1311s each ever decide to sell a few.
^--- +1 to this. The 1311's don't seem to be popping up in the exchange any where near the way they did. IMHO, If you can live with only one 1311 it is a good trade.
