With digital camera its worth looking into researching about it first before buying. They're a type of product which is "u get for what u pay for".
Basically it depends on what u use it for, also need to look at other things (such as more batteries, memory storage, etc) there's quite a lot to think about.
Take a look at this thread, it has some useful links:
http://www.automotiveforums.com/vbulletin/t122288.html
Take a look at it first then post more specific questions so its possible to steer u into a more specific area or narrow down the choices. Going by impulse for buying digital camera is not recommanded.