If you want something bigger, I'd recommend looking at the canon A-series. It's cheaper (and bigger) than the SD-series, and it includes some great features like a flip-out screen.
I'd recommend going to an actual camera store to feel a few different cameras in your hand before you buy. That can inform you more about what you might want, especially if you haven't had a digital camera before.
If you want something that feels like a real camera and takes great pictures, you should check out the entry level Digital SLR (Single Lens Reflex) cameras from Canon, Nikon, Pentax and Sony. Those will run you more ($500 or more), but also will give you much better pictures (but no movies).