the Babylock with air threading is a dream come true. It is a must for serious dressmakers and sergerists, but it is way too pricey for a tool with low usage. In fact, used sergers are very common on craigs list and run about $200. Many people have bought them and hardly ever used them and sell good ones cheap. My opinion is if Babylock is not in the running, then the rest are all essentially the same, and will do good enough for casual use. Ask around your guild where many may have upgraded and have and older one available. Aquick search on Google shows:
https://www.google.com/webhp?sourcei...r%20for%20sale