I know nuts about point and shoot cameras, but my sis wants to upgrade from her 3mp Nikon coolpix as she finds it too slow. Any fast models to recommend? Fast focusing, fast startup and fast zoom would be good, and small size. Budget $400 or less, megapixel count not so important, don't need manual features. She already has a bulky DSLR, so she just wants a responsive and small point and shoot.