I am ready and willing to buy a second sewing machine mainly for quilting but also usable as a normal machine. This for me means the machine must have a wider work surface and be able to buttonhole etc. I have whittled my choice down to Pfaff Quilt Expression 4 and Bernina 820. I need advice and comments as to which is the best. Or of course if you have an even better machine to suggest but please bear in mind I am resident on mainland Europe (France and Germany) so maybe some American machines are not available to me.