Dale, good luck to you Feb. 27th. I had a CE bovine implanted at Duke Medical Center on 11/3/03 due to your exact problem. I was faced of course ,with all the issues you are facing, and choose the tissue valve for about the same reasons you did.
One thing (amoung many) that worried me before the surgery was deciding that the probable second surgery would be "bearable", before I had even had the first AVR. Of course everyone is different, but my surgery/recovery, though not fun, was really very bearable. Only a couple of moments of actual pain(one was the removal of the chest tubes, and it only took about 2 seconds). Recovery was slower than I would have liked, but I went back to work after two months, and I am doing fine . I hope to get back into running and backpacking after a stress test this May.
I guess the point I want to emphasize is that the anticipation was worse than the actual event. You'll do fine.
Bob Bates