1."Depends on which one you want though, one is 6mb and the other is 10mb, big difference."
2. What!?!? As a shooter of 15 years you would know that exposure is determined by shutter speed, aperture, and ISO.
Anyway, if you want something with a little more versatility, speed, and room to grow in to, a used 20 or 30D is the better alternative. All the cameras have a idiot mode(auto, P). The learning curve differential is minimal at best.