There is a mixing bowl to suit your needs among the many different shapes and sizes available. Most home bakers will be satisfied with anything between 3.5 and 5 quarts. Be sure your mixer is capable of handling the bread recipes you like. Consider going larger if you are unsure. Keep in mind that bread doughs need space to move around the bowl as they're being kneaded, so a slightly larger bowl than you would need for cake or cookie batter is never a bad idea.