Before you buy it, try to consider these things below:
Know your budget, don't be afraid to tell the salesman straight way what your budget is either
Know what you want to use the camera for. Is this for a professional or just to take pictures of your kids? it can help narrow down your search as well
Needs Vs desires, is it really what you need? or just because your interested with added bonuses
Do some research, you can do it online by surfing on the internet
Use LCD screen or not?, Consider whether it is right for you or not
Pixel and resolution, The better quality cameras which have higher pixels and resolution provide a clearer picture with much more detail. Which model, in your budget range, has the best picture?
Is the camera compatible with your computer?
Ease of use, make sure you are choosing one you can understand how to use and one that is simple to use
Cost of features over name brand, compare the features and items listed above to find the best camera available to you, not the label