Do lots of research and try them out. I have two Husqvarna Vikings, a 910 and a 936. The 936 is nearly always set up for the cover stitch. I make a lot of fleece throws for charity and use the 910 for that. I used to do a lot of apparel sewing for the DGKs and myself, but now I just do the throws and pillowcases. The threading is the most annoying thing about the Vikings, but they are workhorses and I do love them. Just make sure you get your machine cleaned yearly if you do a lot of sewing with fleece or flannel. Mine seized up on me, thought the motor had gone, but it was just packed with lint way inside. Doesn't matter how well you clean what you can see, the fuzz migrates way inside.