Try the Jandd Saddle Bag Panniers. They work for me on a Cross Check & a San Jose (single speed version of Volpe).

As far as the Cross Check versus the Volpe, I would choose a Cross Check over a Volpe. I have a Cross Check & a San Jose. The San Jose is the same frame as the Volpe with different braze ons & drop outs. Both are great frames. However, the Cross Check has a much tougher powder coat paint. The frame is probably built sturdier as well. Both of them handle similar or the same when fitted with the same tires, wheels, etc. The handling is excellent on both, I can't tell the difference.

I've used bar ends on my Cross Check & I personally don't like them. A cheaper alternative and definitely reliable one is to use down tube shifters.