Camera defined in following categories :

1) Beginner
2) Budget
3) Pocket
4) Long zoom
5) Enthusiast
6) Professional SLR
You need to indentify your need for the camera ,
Then comes brand to chose for budget or beginner any brand would do.
For other you must go for the leaders in the field obviously they are :
1) Nikon 2) Canon 3) Olympus