If you are doing 1000 photos a week, see how rapidly you can process photos with the different popular photo editing programs. Some work very well, but cannot handle large volumes well. If you do a few each week, your choice may be entirely different from mine.
At this stage I'm comparing Lightroom and Capture One. Are you suggesting that Capture One is not good for handling large volumes well? That would not be good for me. Aperture handled them very well.
I will try to dedicate my weekend to testing Capture One Pro 8 and come back with my thoughts.
ps I'm still using Aperture, it's still doing it's job very well, but must start looking to the future.