Husqvarna Viking sewing machines are nice machines. I have and do own many Viking machines. However, my vote is to stay away from this purchase. Not sure how much a used Husqvarna Viking Designer SEis going for these days....but I own one and absolutely love it. I believe it will do all the embroidery you would want to do.
even though there is some availability to floppy disk technology....not sure how much longer it would be available.
my thoughts are that if you get older technology there will be a certain amount of frustration and challenges that will take away from your sewing enjoyment.
well that is my two cents worth