I have a Pfaff, Performance 5.2 with a 10 inch harp. They are no longer made but seem to be an efficient machine. I got it used from a local Pfaff dealer. It had been returned to the shop after being used for less than 10 hours. Good deal that stretched my budget but I have had NO problems with the machine in the past 2.5 years of pretty heavy use. I would recommend the machine if you can find one.
My daughter has an older version of the same machine that she located on E-bay and it also has served her well for about 4 years with not machine problems at all.