How are you computer?I have to agree with my british friend William,guppies are not shoalers---sorry my aussy friend---But it's true the ratio must be one male to two females.
There are many varieties of guppies but,always look for a happy energetic kind of fish.If what you want is something better that the typical guppy you see at the local pet store ,go to one of the places where they auction them like aquabid.com.Remember these are show quality fish but,if you e-mail some of the breeders you might get some not quite as good as show quality fish,but at a great price and still way better than anything you have ever seen at your LFS.
If that's the way you want to go,I have a few friends I can put you in contact with......Harry.