Some things I'd consider:
1. Get one with an lcd screen that can actually be seen in daylight. This is a major weakness in the model I have now.
2. Red eye reduction capability---the camera can send a quick pre-pulse of light to help with this irritating problem especially when taking pics of pets.
3. 3.1 to 4 megapixels is fine for everyday family -type picture taking. You get great 4x6 pics and sometimes great 8x10 pics. The difference between 3.1 and 5.0 megapixels is the fact that great 8x10 pics are always attainable with the 5 megapixel model.
4. Storage space on your computer --- you need a cd burner for the 6 and 7 megapixel models. These pics are huge and take up chunks of memory.
5. Cameras with very high megapixel capability will require more expensive storage media generally.
6. Get rechargeable batteries. Some cameras eat batteries for lunch.
7. Digital zoom is a crappy feature and I would not even use it. It does not capture any additional detail than what you get with the ordinary optical zoom. All digital zoom does is "guess and fill in", or interpolate, to make a portion of an image larger. It does this by adding extra pixels the same way an editing software would do. This gives an "illusion" of added detail. The thing to remember here is if the detail is not there to begin with, you cannot "create" it. So don't waste your money.
8. If you print your own pics, the limiting factor in how good your prints will be is a combination of camera, software, printer, inks, and paper. A great camera and crappy printer equals crappy pics.
Just my thoughts.
T.
