Powell, you're absolutely right. As long as you have a competent recording engineer, the edit will be absolutely invisible. I do some recording engineering work on the side, and it does take a while to get a good edit, so from a cost perspective, I think I would try to keep the number of edits you want to a minimum. On the other hand, for some of your pieces you may consider splicing. I don't feel this is cheating, because you're still playing the piece, just in smaller sections. If this is an option, and personally, you should look into it, especially for the Mozart, since according to you it's not finished, you should definitely go for it. If you're going to do it that way, sit down with your engineer, and work out exactly where you're going to stop etc... However, it's important that you are able to start and stop at almost the same tempo you were at before. Because of this, I usually find it easier to record in overlapping segments, cut them to size, and then splice them together. Just my two cents.