So this is the house you are buying, correct? It is not your home and the current owner is the one that will be having the work done, correct? If all that is right, I would have them correct the water drainage problem. Have a swell built to direct the water away from the home, might consider an underground drainage system with a catch basin and French Drain combo and put an extension on the rain gutter downspout to move the water away from the foundation. Then have them spray the crawl with BoraCare and enjoy life. I would also have the insulation removed, in Mid TN we really do not need to insulate our subfloors. I have seen insulation on subfloors causing more problems than it solves.