I started with a couple of color sets from Amazon and I've added to them with Gutterman, Sulky, Robison Anton or whatever from JoAnn. I like the 1000m spools for colors, but have ordered 5000m spools of white ThreaDelight as white was the first thing I ran out of. Rayon thread seems to sew the nicest in my Brother machine, but it is also more subject to fading than Polyester thread. I try to use Poly thread for anything that is going to be used a lot and washed frequently.