Just wanted to add regarding stitch regulator. The reason the lightening stitch is so much more expensive is it requires a different motor (one that can get a digital message as opposed to analog message from the software).
After 7 years of quilting on it with the regular stitch regulator, I just splurged and upgraded my Innova from the regular to the Lightening stitch (LS). I have hemmed and hawed about it for several years, thinking the price wasn't worth the upgrade, especially because I was, for the most part, satisfied with what my regular SR was doing. Boy was I wrong! The responsiveness and stitch quality of the LS is so wonderful. I know I will definitely get my monies worth out of the upgrade.