People with kitties live longer, healthier, happier lives. Before choosing your kitty. Depending on how you answered these questions, choosing the right kitty can take some time. Once again, it depends on how you answered the question above. Most places have some sort of 'kitty gaurantee' for 24 or 48 hours.
Most kittens are very playful and energetic.
Even though they are cute, they can be a handful. Kittens should not be left alone for long periods of time, as they need to be litterbox trained and they are very curious. They also need time to get used to their new home and that can be easier if you are there, as they will associate you with their new surroundings much faster. Adult kitties are more appropriate if you work outside the house and the kitty will spend a good part of the day alone. This is a personal preference.