I have a Bernina 630E that I bought used on e-bay about 2 1/2 years ago for about $2,700. It had only a couple hours on sewing and no time on the embroidery unit. I love my machine. I have the BSR foot and have used it several times but still not real good with us.
I have a Bernina Dealer really close to my home and since I have bought sewing furniture and thousands of dollars in fabrics there I got a class on the machine for free. My only problem was that the software for the embroidery that came with mine was already obsolete and I can't get anyone to help me learn how to use it. They have helped me learn how to use the unit but not how to use my computer with it.
Anyway, the Bernina is a really good machine.