I bought a White model 634DE- over 20 years ago, and it is still a great machine, though I don't use it all the time. It has a built in rolled hem- 3 or 4 thread stitch- differential feed-color coded lay in threading which is great, and uses regular sewing machine needles. I tried many brands when I bought this one and it was the easiest one to use & thread, and the price at that time was around $400. I just wanted to serge seams so I didn't need anything more expensive. So decide on how much your going to use it, what your going to use it for, how much your willing to spend and go from there.