I know this past summer the price on those got reduced to $2200 for a new machine and $1995 for the class used machines at our LQS. I'd check on the warranty too that is a big thing you don't want to be without when I purchased the 550QE from my LQS it had only been used for demo by our Bernina Rep on site. So I didn't mind getting it because I knew none of the students (I know I'm hard on some machines in class because I don't know exactly what I was doing at the time) and I've got the full warranty on mine.
I'd also find out if they have the Bernina Academy for newly purchased machines we're doing lessons once a month on all the different foot pedals, stitches etc and each month we create new projects each month for 10 months.