Replacing fuse box, upgrading to gcfi protection

[Swetha Mandava]

I'm buying a duplex in PA and the general inspector was quite shocked with the electric wiring in the house.  Exact words:
"Fuse boxes present for main services. This system creates a hazard with exposed electrical connections during fuse changes and allows overfusing which is a fire hazard. No main grounding through a rod is present with the age of this system (meter jumper cut is a potential hazard), neutrals/grounds bonded in 1 subpanel is no longer approved. Recommend evaluation for replacement by a licensed electrician. Recommend upgrading All receptacle to GFCI protection within 6 feet of all potential wet locations."

Seller insists it has been working just fine and doesn't need replacement. 

Any one with experience in this - opinions? How much would it cost?