If I were to buy only one machine I would buy one with the widest harp I could find. You mentioned you want to machine quilt your projects well this would make your life much easier. I love a built in needle threader. My eyes have a hard time threading a sewing machine needle. As far as stitches go a straight stitch, zigzag, appliqué type stitch are the main ones I use. Most machines ave feed dogs that drop so you can fmq. A table extension sure is helpful. But I can't stretch the fact that a wide harp is the way to go. Let's us know what you decide.