Currently running Hella 500FF driving lights center of truck in front of grill, with Hella 450 fogs below them all mounted to my bull bar. The 500's give a long beam, the 450's give a nice wide pattern with a good cutoff. I had a set of 550 fogs and while they did give a much larger beam pattern the 350's are more than adequate.
I will take pics next time I go off pavement to show better pictures of the light patterns. IF you want to see the current patterns or my mounting configuration I have a thread asking about dimensions here--->
viewtopic.php?f=69&t=4815. I was initially going to run the 500's in the center and put the fogs beneath them, however I like this configuration better.
I will be mounting the 550's I took off the front along with a set of Hella 550 driving lights on the roof soon (weather). I will put the fogs on the oustide with a slight downward angle (10 degrees maybe) and the driving lights in the center. I will play around with the angles to get a good light pattern.