While I only own a sewing machine and not a serger, the right machine for you probably depends on your individual needs. This Serger Information Site, http://www.sergerplace.com suggests taking models for a "test drive" to get the feel of them. Babylock is another popular brand you may want to add to your list.

Babylock is the brand to get but you pay for it. Brother makes decent affordable Sergers. Take a look a look at my other answer http://www.recommendr.com