I almost always see buyers pick a digital camera which offers much more than they need. Before you buy a camera, you need to know exactly what you need. What is the camera going to be used for? What type of photography are you going to use the camera for? Indoors, outdoors, sports? Will you be taking photos in light conditions, dark conditions? Are you going to use an automatic feature, or do you want to go manual like a pro? Are you an experienced user? What are the main features you want in the camera?
Most importantly, what is your budget?
It is important that you can answer all these questions before buying a camera. It will make your decision much easier. Someone buying a camera for outdoors use is going to need something much different than someone that is going to be using it for indoors use.