I like to buy brushes individually. I've got a set of brushes that I use for shows and special occasions as well as an every day brush set. My specail brushes consist of wooden backed hard, soft, mud, and face brushes all with natural fiber bristles, a wooden hoof pick, a metal mane and tail comb, a shed blade sweat scraper combination, and a medium nub massage/curry comb. I don't like the nylon or synthetic bristles because they tend to fray after only a few uses so both my sets have either boar/pig, horse, or goat bristles. But none of my brushes match which gives them more character.
Show me a horseman who hasn't fallen and I'll show you a man who has never truly ridden.