I'm trying to decide what sewing machine to buy. I have had two different Brothers and have not been happy with them so I'm looking at a Viking or Pfaff sewing machine but not sure which one. The reason I'm not happy with them when it comes to putting squares together and you sew over the seams the line is not straight. I don't think I need an embroidery machine I just need a machine that will work with different thickness of material.