www.dpreview.com for reviews.
Look at the entry-models of Canon, Nikon, Olympus, Sony and Pentax
Personally I'd go for Canon or Nikon, just because they have the widest range of lenses and accessories. Image-qualitywise they stand above the compitition when it comes to difficult conditions.
Think this trough carefully, as you'll pick a system, rather than a camera. You are bound to buy new lenses and other stuff in the future and these things are always linked to the marl of the camera. So you can't switch fro Nikon to Canon after some years, without changing your entire arsenal.
Pich up a model with IS kitlenses ( gets good reviews) and start shooting. In some time you'll find out wether you need to buy new lenses fot the specific type of photography you want to exersice...