Best Working Colorspace

The whitepoint mismatch does not matter because when you do color conversions there will be whitepoint compensation which syncs the whitepoint of the source space (i.e. AdobeRGB, 6500K) to that of the destination space (let’s say the paper white). Originally it applies only to the perceptual, saturation and relative rendering intents, not to the absolute rendering intent. However, now in the current ACE(Adobe Color Engine) CMM, the whitepoint compensation or adaptation always takes place. If you use earier versions of Photoshop or other CMMs in CS2, then the whitepoint compensation may not apply to the absolute renderng intent, as supposed to be normal.