Not to add to your choices, but my mapping software says the quickest route from Grove City to Cooperstown is to take I-79 North to I-86 (old Rt. 17) west then on to I-88. Six hours and 8 minutes of driving and 416 miles.
IMHO, the 'southern tier expressway' in NY is definitely more scenic that I-80 in PA. Good lunch stop would be Corning, NY where you can see the glass museum.
Tom and Katharine
'07 Winnebago Tour 40TD, 400hp Cummins
RVing for 19 years & 150,000+ miles