which a beginner probably isn't going to want to do
however, dont narrow your search to  only over 8 megapixels, take a look at the Nikon D40, everyone hates on it because its only got 6 megapixels, but the sensor is extremely well built and this will give you as clear shots as a 8 megapixel or even 10 camera. Plus, its a really great beginner camera, people underestimate it, but really consider it. The price is great for what you get, and with the stock lens that comes with it you'll be set for some great shots.
and honestly, canons are no better than nikons in build quality or clarity.