Currently I have 9 machines at my house and two more at my mom's. If I had room for them, they would be here too. I wish you the best in trying to decide which ones to part with. My collection of machines began when my first machine died on me. This left me without anything to sew on, and that just didn't set well with me. From that point on I decided it would never happen again and thus began my small collection.
In your case, it sounds wonderful that you are saving these wonderful machines. They are wonderful people out there who would love these machines as much as you, so try selling some of them to "good homes" where they will be appreciated. It's a good cause...