I've been pretty happy with my Eversewn Sparrow 15. Weighs under 15 pounds, is a mechanical machine (no computer), but has an assortment of stitches including zigzag. Has a threading assist. Costs under $200 but you will most likely want to buy a 1/4" quilters foot (think that was $12).
https://www.eversewn.com/sparrow-15
Downside -- is a bit slow for when I want to speed sew, for most of what I do it is fine. It is a bit louder than the other machines used by my sewing group. Mine developed a "chirp" that required me to take off part of the casing and oil where they don't want you to oil, but only required one screw removed to do that.