I have been quilting on and off for over 20 years. During that time, my taste in both colors and quilts has changed. I would always want my fabric to be usable for whatever new style I want to do. Thus, I would leave whole pieces, both for flexibility and for sale-ability if I want to cash in what I have and convert to something new. I think people would be more likely to buy, say, FQ's than 2.5 inch strips.
I recommend that if you're inclined to want to cut things up, cut a 2.5 inch strip or two from each of the fabrics and save the rest. Then you have both worlds, a big chunk for flexibility and a strip to play with now.