I like the TY plushes as a good source for brushable hair that manages to resemble their canon hairstyles, though their faces don't always look so great.
Obviously on the molded-hair side of things there are any number of options. Blind bags, funkos, design-a-ponys, paint-a-pony statues, UK magazine freebies, 2010 gift set releases, burger king toys, and so on