Welcome from Texas. I hope you find joy & encouragement here.
You didn't say how many UFO tops you have but if you didn't want to quilt them yourself have you considered sending them out to be quilted? I've never sent a quilt out & will just speculate here. If you have $1500 to spend on a machine & sending a quilt out to be quilted costs $150 (have now idea on this cost), you could have 15 quilts quilted for that $1500 you would spend on a machine. The down side to that is you are still left with your little Bernina that you don't feel comfortable quilting on.
Here's another thought! This past year I made a Calif. King top that I made for our bed. For a couple of years I fought with how I was going to quilt it since it was so large & would be heavy & hard to quilt on my little Janome Magnolia (6 1/2" throat). I decided to make it into a "summer quilt" with no batting & I absolutely LOVE it. As a matter of fact, it's my very favorite quilt that I've ever made. Perhaps you could make some of your tops into summer quilts (no batting inside) & your Bernina could handle that.