Hi, Linda. I think you're wise to keep looking. Most people are brand-loyal, but you can go and 'test-drive' some of the better ones and then see if you can find one at a good price. Personally, I love Bernina products, in terms of their capabilities and where they're manufactured (Switzerland). I used to sew higher-end custom figure-skating wear and used my serger almost exclusively for construction.
Now, to ask you a few questions regarding your chain-stitch machine: what model, where did you buy it (store or e-bay, etc.) and do you feel it's worth investing in one? TIA
Carolyn