FYI: megapixels have more or less become a marketing strategy for camera manufacturers who know their consumers are ill-informed.
You don't need 15 megapixels. If you did need any camera over 8 or 10 megapixels, you wouldn't be on NS asking what to buy. There are so many more important factors to consider when buying a camera.
Since you seem quite new to photography, don't make the mistake of investing on the camera body and buying a shitty lens. The lens is infinitely more important than how many megapixels the camera has.
Read a lot of reviews before you purchase anything, cuz it sounds like you'll end up making a rookie mistake if you don't.