Having a trustworthy dealer is essential. Then test-drive with your own fabrics, threads, and typical sewing tasks. Prepare samples of piecing, quilt sandwiches, rolled hems, jeans to hem, whatever YOU need. You've got to love the feel of your machine. That said, I've got several machines, and I think BERNINA has the most power, precision, durability, and reliability. They are more expensive, but totally worth it.