Thanks for update! I guess I need to understand what the 6112s are , sounds like an upgrade
6112s are an upgrade to the 5100s, just as the 8112s will be an upgrade to the 6112s. But those (61and 8112s) are more for off-roading. For everyday use on pavement the 5100s are totally perfect, since they will also easily support light-medium off-roading as well. They really are night and day compared to the OE shocks. I would bet you wouldn't disagree
Even the 4600s, which are very similar to the 5100s except that they are not ride-height adjustable and are in essence, straight AM replacement shocks to the OE, which come crap shocks on our trucks..
I know I'm biased, but in reality both Bilstein and Fox are great shocks. Bilstein tends to run cheaper for the same quality, so that's why folks tend to lean towards them.