Im looking into buying a digital slr, but im finding it hard to find the right camera.

I am a photography graduate, trying to get a good camera that will be suitable for professional work.

The main features i want are: spotmetering
manual and semi- auto features
6 - 8 MP
Use of cable release .

What camera's include these options?

Also i want to know what the difference in file size is between say a 6MP camera and a 7MP. What is the max file size you can get in inches with the best resolution?.


Thankyou in advance