If you are in a drought area and have water seeping in now it could get a lot worse when it gets wetter again.
I agree with create drainage to take the water away from the house first before starting a repair. Does the house have good drainage away from the foundation, a sump pump and drain tiles around both the outside and the inside of the foundation footings? Does the sump pump move the water far away from the house or does it just recirculate the water through the basement over and over? Include a mold test in the basement as part of your inspection and make sure you can cancell the sale if mold is found.
My expereince is a wet basement never really gets completely fixed.