Rendering a prop - how do I set up IBL?

http://i275.photobucket.com/albums/jj314/scottmichael28/43-1.jpg

Here are some more of my ongoing experiments and thoughts, having spent several hours with this (there is a near black color sphere (static mesh) in the background surrounding the object in all four):

  1. Static lights destroy the metal reflections here. I’m going to try some full environment builds and see if there is a difference. I’m not sure why the advice to use static lights with spheres.
  2. Ambient cubemap in the post process seems to destroy the AO, like its reflecting it too much from every direction. What is this useful for? The documentation seems to admit that it has limited usage.
  3. I want the AO of the upper left image (or better if that’s possible), but the reflections of the two right side images. Is this possible or is it a necessary evil to have less AO with the metal reflections?
  4. Is the skylight used more for colored lights over an environment than for reflections (like a substitute for placing colored lights all over a full environment)? The documentation seems to say so.

Above all else, I’m having a very difficult time understanding how to control the background color. In Unity there is simply a background color button in the camera settings. Here, there is no such thing (that I know of), I place a sphere around the object, but the minute I make its color above pure black it goes light gray and washes out the lighting on the object by over-brightening. I want to figure out how to place a dark-gray background behind the model.

Admittedly this is as much me collecting my thoughts at this point as it is asking questions. Any comments, corrections, directions, re-directions, help, suggestions or clarifications?