Not having a stitch regulator would be a no sale for me. Yes, this!
I think $4000 is a lot. I would consider a newer, as in younger but still used, machine with a smaller throat opening (22 inches) but with a stitch regulator. Is it possible to wait and save up so you can get a better machine? It might be hard to sell this machine again when you are ready to up grade. I waited and bought the machine that I really wanted.