We went from transcription to Dragon, saved well over $1500/month, and the quality went way up. The "big" services we tried did not proofread at all. Roger, I would tell your partner that he is welcome to pay the $1500 out of his salary, but you are going with DNS. No reason to be held hostage by a partner who does not want to adapt.
The option of getting a file sent, proofreading, and importing into AC, while technically feasible, have huge issues or redundancy. Add to this that we found out our "big" transcription service was actually taking our dictation, having it re-read by non-native english speakers into Dragon, then sending us the files!! It is one thing to opt for class and convenience in dictation, similarly to opt for being ferried about in a limo rather than driving, but quite another to be treated like a special needs kid in the back of one of the little school buses.