http://www.photoradar.com/list/revie...2=250&filter3=
pop the adress in your browser .It's a series of reviews from this site that may help you narrow things down.
Megapixels are a bit of a myth in a way as it depends on the size of the sensor they are crammed onto.
Personally I would be looking for a good optical zoom range and how the camera feels in my hand.Nothing wrong with Argos but you can't get a feel for the camera .Go to a store where you can pick a camera up and play .(also research price as most places will price match)
You may also consider something that gives a degree of manual control (maybe not in the beginning but as you get more experienced it can be frustrating if a camera is making all the decisons for you and you can't get the shot you want.
Narrow it down and then use something like google just type Nikon coolpix review and you will find loads of info.
Good luck in your search.