I have a Brother PQ1500 that I used for several years as my main quilter before I got the HQSweet16. The PQ1500 is a straight stitch only machine. I still use it for piecing as it gives me an excellent scant quarter inch seam using the quarter inch foot that comes with it. It was a great FMQ machine as well. No stitch regulator, but if you practice enough, you'll probably find you don't need one. The only stitch regulators that I've tried for sit down machines and domestics are the ones that are available on Bernina domestics, Bernina sit down long arm and the Innova sit down long arm. I didn't like any of those- just didn't notice that they made much difference in the quality of my stitches.
Rob
Rob