Rhett Kelley makes some awesome whips. He's actually been extremely helpful to me and has answered a lot of the questions I've had regarding construction methods. He also makes some gorgeous handles from exotic woods for those who make their own whips, or would like a fancier handle for the cow whip they already have. I have a couple and they are absolutely top notch.
@ Ednemo-- It is quite hard on the hands when first starting out. I've got callouses on top of callouses these days from plaiting nylon. I had to take time off between whips just to let the blisters heal, but now I'm totally hooked. I'd love to see a picture or two of the whips you've made if it's possible.