Pfaff 7570, Mem Craft 9000, or Viking Rose?

Question

I'm interested in purchasing one of the new computerized embroidery sewing machines. I'm looking at the Pfaff 7570, Memory Craft 9000 and the Viking "Rose." Can anyone give me advice on the strengths and weaknesses of each? I have the Pfaff 1471 at present. My needs are: Good buttonholes, good heirloom sewing and nice neat automatic embroidery stitches. I would appreciate any help.R. Salguero