What you have found is a treasure from your mother to you. Value is most likely in the sentiment. I'm guessing, because of the age, they are, at best, double bed size. So, (1) pick the one or two you like the best and pay to have a LA quilt them for you. (cost would be $100 - 200) depending on how it's quilted --i.e. all-over design or free form. Enjoy them. Though i agree hand quilting would be wonderful, I question the costs. Remember, if your mother was making that quilt today, she certainly would have machine quilted it if she'd known how. These tops would have been made and finished to be used.
Pick one the "play with". Either try FMQ or hand quilting if you'd like. If you put them away, there is always that chance they'll get lost or forgotten. What a shame that would be.
Enjoy the connection to your mother and her labors of love for her family. That's the treasure.