I think call-in dictation would be fine for 1 doctor. Remember that it will tie up a line the whole time he is dicatating, though.
Another option you might consider: I've seen where you can lease the use of a digital system from other companies. I think a service I used to work for did it. You pay per minute dictated. It might be cheaper than having to buy the call-in system and pay the monthly fee for an additional line if you don't already have one.
Good luck!
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kkb (Karyn), who considered herself a newbie after 18 years doing MT and even though she is no longer working in the field, still remembers what it was like to be a newbie!