M.A.
Hi-
We just had this done, although we are in a split-level with a finished basement, and the foundation wall was probably about half the size of a regular basement wall. We had Perma-seal come out and do it; the cost was under $400 for interior; it would have been under 500 for the outside. To be quite honest, we had them do a couple of other cracks from the inside over 10 years ago, and have had NO problems with leaks at all. The most recent crack we had done about a week ago, and it was fine in our most recent rain. No water at all. We also had a mold guy out that we had used for my son's bedroom (plaster) wall and he said there was no need for him; just get rid of the damaged wood and carpeting.
Make sure to get more than one estimate for any job you want done. I know it's a pain, but it really ends up saving you money and headaches later.