I emphasize with your loss. That lasted you a very long time. I hope you enjoy whatever newer machine you choose. Try to test some and see what feels right. Some might feel like your old one did, and others just might not jive with you.
Try to recycle your old one for the metals. I'd hate to see someone all excited about getting a good price on your old machine for it to only last a bit for them.
I also have spent many, many hours shortening and rebuilding clothing (along with making from scratch), and after all these years, I am kind of tired of it and would just like to quilt.
May your sewing be smooth with whatever machine you decide to get!!!