I have a few machines and love them all. My favorite for turning a tight radius, pivoting, as one does for a blind-hem appliqué is the Bernina 440 with 5.5mm (narrower) feed dogs. It also helps that the foot control is so precise, stops where you stop, no extra stitches. My older Bernina 930 is good for this except that it lacks needle up/down by heel tap. Some 930's have that, mine was an earlier issue of that model. I think the ideal features for that are narrower feed dogs, knee lift, and either needle up/down by heel tap or programmable needle down. All that said, much prefer hand appliqué :)