Advice and previous experience with basement water problems

[Mariah Porter]

I've had several issues with my first property (that I am house hacking) and have already had to pay for multiple costly repairs. 

I recently discovered some swelling baseboards in my laundry room, signs of water intrusion and got a foundation and basement waterproofing specialist to come out. He said that I've got water under the foundation and basically surrounding the house and that I would need to have them come in jackhammer around the entire perimeter of the interior and install water guard drainage pipes and a sump pump and dehumidifier under the stairs. 

He quoted me about $17,000 and that's not even including the restoration of the drywall, baseboards and carpet after they remove it, as well as getting an electrician to run an electrical outlet under the stairs to power the sump pump. I'm trying to find a second opinion, and hopefully a third opinion but having a hard time finding another company that deals with this kind of thing.

Has anybody had to do this type of thing to their own property? Does this price seem reasonable? Is this the only solution?

I'm feeling pretty discouraged because if I have to pay ~$20,000ish to deal with this it will absolutely destroy my cash flow, but if I tried to sell without fixing this problem I think I would end up taking an even bigger loss. 

I appreciate any comments from those with relevant experience or insights.