What brands of solid color cotton quilting fabric do you use?

For those of you who make quilts with solid color cotton fabrics, what brands do you use? I try to purchase from a variety of brands for best color variety--often when I'm at a retail store.

But right now I'm looking for specific colors to color match for a project, and am planning to look at color swatches from a few brands. Aside from Kona, what other brands are there?

Thanks!

I've hears Bella Solids are also good. Fabric.com has a few different brands, including FreeSpirit solids, Amy Butler solids that are sometimes on sale.