Robert Atkinson , Nov 21, 2011; 07:54 p.m.
Why not just use the viewfinder? If you shoot in manual mode then metering mode should make no difference. Metering is the cameras way of evaluating how bright to make the scene and in manual mode you give all that information to the camera, so the camera has no need to check for itself.
On the other hand, if you are in for example Av or Tv then evaluative metering would probably make the shot a little darker than CWA metering for the situation you described.