what you could of done was get a interior french drain, since the lot sloped back to front, get 2 or 3 estimates and deduct estimates from asking price......
hey to fix the water problem will cost 7 grand, heres my offerfor 7 grand less, deducted to pay to fix the water problem.
most of those companies offer a liifetime of home dry basement warranty that transferes to later owners.
in the case of my home i did get some water in the garage, coming up thru crack in garage floor, they added about 16 feet of additional drain connected to their system at no charge, which conveniently fixed the crack
your passing on a home you liked after looking for 10 years only hurt yourself