Am I gonna get my money out of re supporting the houses posts?

[Jameson Sullivan]

So I bought a house as a live in rehab and it son post and piers. I need to do SOMETHING with the foundation before I start tearing inside stuff apart and remodeling but heres my questions,  I have had two guys out so far. The first guy said he could do a number of things in the 20k range as far as supporting the foundation extremely well but that he could also come in and jack up the house, replace a few posts and and that would even out my kitchen( which dips a couple inches) and would prolong the life of the foundation. The second guy came out and talked about installing 6 8x4 under the house and using metal supports resupport the house in between the three existing spots(the main beam and outside supports.) This second one would run about 18k but would come with a 75 year transferable warranty. 

My question i do I go for the full shebang and eat into potential profit or will the extended lifetime of the home and the sturdiness of the foundation be enough to cover the investment?

I understand every home and area is different, but just as a general rule does anyone have any thoughts?