Alas, there's no indication that the combined algorithms of converting bitmap (result from scan) to pdf and then pdf to Word is much better then the one-step algorithm to convert a bitmap to Word. If it was, some smart OCR-company would have done already!

However, if you want to give it a try, see some previous discussions:
http://forums.cnet.com/5208-6138_102-0.html?threadID=295197
http://forums.cnet.com/5208-6138_102-0.html?threadID=335069

While reading through them, I note the second one (with already 36 posts) is started by a question from you. If no good answer came out of that, I doubt if this new question will lead to anything useful.

There's no better converter than a skilled human typist. So I'm afraid my advice is: better start typing! Or hire an off-shore (Indian or so) data entry company. They are cheaper than a USA one.

Kees