I am not too convinced that BB's D3D render settings are optimal enough.  I just posted the image linked below using straight IDL.

http://www.renderosity.com/mod/gallery/index.php?image_id=1994447

Prior to that, I used BB's settings with Gc for all materials and rendered an image lighter than anticipated.  However, it occurred to me afterwards that the light settings supplied by the model (candle point lights) were probably too bright.  The Gc + tone-mapping balance might be precise but you will need to be very critical with your light setup.  What BB proposes is a compromise option to incorporate P8 rendering features until PoserPro 2010 is officially released.  At the moment Robyn, I wouldn't halt Gc conversion just yet.