5100 with new coils or stock?

I currently have a crappy spacer lift that the previous owner had put on. Finally gonna take it off. I'm looking at going with bilstein 5100 all around and aal in rear. What's the biggest difference in keeping the stock coils vs getting the eibach coils? If I keep the stock ones and set the fronts at top setting which size aal should I go with in rear? I'm running 285/75/16 tires with no rubbing at all. Previous owner already trimmed and cmc. Thanks.

 

The biggest difference in the stock coils and the eibach coils are the eibach coils give you a 1.6" of lift. With the stock coils on the billies set at the top setting, you preload the spring to get 2.5" of lift. Whereas the eibach only need to be set to the .85 setting. Less preload, better ride
I'd suggest a 3 leaf progressive aal for the rear, wheelers, toytec, ect...
That will level your right out, maybe a tad higher in the rear if you have the tsb leaf pack.
If you haul weight occasionally, wheelers has a heavy-duty 3 leaf progressive aal too. Just throwing some options out there for ya.