If you are constantly feeling held back in your creativity and productivity, if you're frustrated with the alligator fight, I'll go out on a limb and say it's the space of harp, not a stitch regulator. I don't hear much about the stitch regulator being a big factor in decisions to upgrade, but a vast majority of people want the bigger harp. You'll never regret getting more space if you are thinking about it with every quilt you make now (or not making because of the frustration you feel).