My vote is for the Janome. They are built with mostly metal and make wonderful stitches. The accessories are much cheaper than Bernina and you can purchase third party specialty feet for them.
My best friend has a Bernina (not sure of the model) that I sew on when I am at her house. I am not impressed. The straight stitch is fine but think it makes the sorriest satin stitch. No amount of tweaking has ever made it come out to my satisfaction. She just told me yesterday that she will be selling it soon. (She uses a Viking Diamond for her primary machine.)