You made the best decision. Why?
It has the larger sensor. This means your High Iso pictures will have less noticable grain. You will have more detail in addition than the Z100. And, when you digital zoom x3 (not including the optical zoom) you will have more detail than the Z100 zoomed x3. OK, the Z100 goes to x4, so what, you have the smaller sensor in the Z100 and you are stretching this smaller sensor to a x4 zoom. The picture will be more degraded than the Z1080's. Keep in mind that you have in 35mm terms a 450mm zoom on the Z1080. For what would you need more than this? This is a total of a x12 zoom for the z1080.
The USB charger that can charge the Z1080 NP-40 battery from a computer connection is found on the big auction site. Just search for "NP-40 USB charger".
O.K. the Z100 has a 28mm (in 35mm terms) lens. Nice. But what if you need a 24mm, a 21mm? It never ends! The 28mm is nice for landscapes, sure. But the 38mm lens of the Z1080 is still moderately wide. It is a focal length that is a preference for photojournalists. Yes, 35mm focal length (38mm in this instance) is the standard choice for photojournalists who prefer one lens on their SLR. It hardly distorts, and keeps the photographer at a safe distance from human subjects. 28mm on the other hand, may be used wrongly by some photographers by allowing them, hear that....allowing..., to get too close to a human subject. Closeness, less than 5 1/5 feet to a person will start to cause their nose to grow, and feet to look small, stomach to look chubby. Move back any distance more than 5 1/2 feet, and the person will look more slender and natural. So, if you want to be remembered as overweight, simply have people use a 28mm lens setting (wide angle) and take your picture at 5 feet. The other choice is to use a 38mm setting and have your picture taken at say, 7 feet...better. Or, use a 50mm setting at 10 feet.....even better....and if you use a moderate telephoto zoom at 85mm setting and take the picture at 30 feet distance, you will look even thinner and more the natural you that your friends actually see.
So, the moral of the story here is that 28mm is good for taking pictures of the Golden Gate Bridge in San Francisco. But if you get as close as 5 feet from the person you are recording...look for distortion. This is not a Casio feature....this happens with all cameras that are 28mm or have "wide angle lenses". All makes of cameras can do this distortion.
What is nice about having a pink camera is that when you hand it to a person who already has 5 cameras given to them by people in the "group shot", you know which camera is yours when it is returned. Also, pink makes people smile.
...Timber...