If I could afford it, I'd get a Babylock version.
I'd stay away from the Viking (Husqvarna) sergers, I've heard lots of people at the swedish sewing board having big troubles with them.
I've had my Singer coverlock (serger coverstitch combo) for 9 years now. I love it! I've sewn tons of baby/childrens clothes on it and even some for myself. It is really robust and changeover between overlock and coverstitch takes about 4 minutes (I've timed it).
Anyway, that is my recommendation.