Buying a house with foundation problems- HELP!?

I am looking at purchasing a home that has some foundation problems due to water damage. The house has no water run offs or gutters and I know this has created a HUGE problem. The house is very sound. I walked through it, the floors do not creek, there is a slight sinking on the first floor in one corner but nowhere else in the house. The area the sinking is in, however, is resting on the foundation wall. There is some water leaking into the basement. The house was built in 1900. I know with older homes sinking and other problems are expected. Foundation problems are considered MAJOR PROBLEMS, but do you think this is too much problem to get into? The house is selling really cheap so with a 203k loan I can get around 25,000 for repairs if needed. Please let me know your opinion. The house looks beautiful. This is the only major problem and some small stucco damage on the front. I was thinking that once I get the foundation repaired and fix the water run off and gutter problems, it would be a great investment for a beautiful home.