Hi. I took a photography and yearbook class so I know somewhat a alittle about cameras. But I'm really looking for a digital slr camera. I dont want a point and shoot camera (because I already have one). Im a little confused about the megapixels. What exactly does a higher mp mean? Does it mean it can capture images quickly and more accurately? I really do want to buy one thats reliable, good quality pics and easy to use. Thanks!