There is a new brand that has not long been out. Its called fuller fillies they have three different types of boots suitable for different things.

http://www.fuller-fillies.co.uk/collections/accessories.html

Hope this helps

Not sure what your budget is but Equitector are lovely boots and do a range of sizes.#http://www.equitector.com/ladiesInches.html

I got Toggi ones too and extremely comfy.  Just worry that they won't have them when I need another pair!