I agree with what PaperPrincess said completely.
I have just recently started using my mother's old 301A and I have to admit that I'm really liking it for piecing. My Bernina 180 is still my go to for garment construction and mending though. Machine likes and dislikes are very personal. Go to some dealers and try out what they have. Finding what type of machine you are comfortable with is the most important thing. I'm also big on deal support and their guide classes.