You have to decide not only the colour you would prefer but whether you want a male or a female cat, each has its own characteristics. You will need to decide if you want a long haired or a short haired cat.
You also have to look at your personality and lifestyle and determine how that will work in with the personality that can be expected from any particular breed.
Fortunately there are many books that give comprehensive details on the personality types of the various different breeds and while they are a generalization they are also quite accurate in most cases and can help you make the right decision more often than not.
Some breeds require a lot more attention than others, and you will need to decide how much time you will have to devote to your cat. Some breeds will always be more suitable than others when taking into account the term of their lifespan, which can be up to 20 years in some cases.
You will need to decide if you want or have the time to look after a kitten and you may think that getting an older cat from an animal shelter may be a better option. There are certainly a lot to choose from as animal shelters are generally overflowing with unwanted pets, just waiting for a home.
When choosing your cat, see how it interacts with you right from the outset, as even in one litter there will always be a personality that stands out and shows that it wants you to be its owner. More often than not the kitten will choose you, rather than the other way around.