I agree with everyone urging you to adopt! There are so many wonderful dogs in shelters waiting for the right person for them. I've done a lot of foster care with animal rescue groups, and let me tell you I've never had a foster dog I didn't like, mutts and purebreds alike.
Almost any dog can be a wonderful companion and friend with proper training and socialization.
That said, along with the breeds Jamie_Dog_Trainer recommended you stay away from, I'm going to be honest and say that a herding dog may not be the right fit for you. They are absolutely wonderful dogs, I love them with all my heart and they're my favorites easily, but they do tend to nip children and can sometimes be too high maintenance or need more exercise than most families can provide. Herding dogs work for my household, but many of them are turned into shelters every year by families who are off-put by the constant, frenetic energy, and nipping habits. They're prone to fear biting because they're so sensitive, and they can become neurotic if not given enough stimulation, both physical and mental.
I'd advise you to do some reading about different dog breeds, and then go check out the shelter and PetFinder to see what you can find. Oftentimes mutts are absolutely stellar dogs. Also, don't adopt until you've observed the dog in multiple situations and gotten some time to see how they settle in your house. Most rescues and shelters offer a two week trial period, and while it's heartbreaking to give up a dog that's not right for you, it's better not to risk it if you see warning signs.
Good luck in your search! Let us know if you find a good dog for you. I've found this breed selector from AnimalPlanet is pretty accurate and thorough: http://animal.discovery.com/breedselector/dogselectorindex.do

That said, along with the breeds Jamie_Dog_Trainer recommended you stay away from, I'm going to be honest and say that a herding dog may not be the right fit for you. They are absolutely wonderful dogs, I love them with all my heart and they're my favorites easily, but they do tend to nip children and can sometimes be too high maintenance or need more exercise than most families can provide. Herding dogs work for my household, but many of them are turned into shelters every year by families who are off-put by the constant, frenetic energy, and nipping habits. They're prone to fear biting because they're so sensitive, and they can become neurotic if not given enough stimulation, both physical and mental.
I'd advise you to do some reading about different dog breeds, and then go check out the shelter and PetFinder to see what you can find. Oftentimes mutts are absolutely stellar dogs. Also, don't adopt until you've observed the dog in multiple situations and gotten some time to see how they settle in your house. Most rescues and shelters offer a two week trial period, and while it's heartbreaking to give up a dog that's not right for you, it's better not to risk it if you see warning signs.
Good luck in your search! Let us know if you find a good dog for you. I've found this breed selector from AnimalPlanet is pretty accurate and thorough: http://animal.discovery.com/breedselector/dogselectorindex.do