Personally, I don't like nylon thread. A lot of quilters like it and get along fine with it, but I just don't. When I SID, I prefer a lighter weight thread. My favorite for this is So Fine thread. It's a light weight polyester that come in a ton of colors. My only "color rule" for myself is that I don't use a dark thread on a predominately white or light top and I don't use white if it has a lot of black in it.