To chime in on the Bilstein shocks:
I tried out two different sets of the Bilsteins on my 1995 E250 RB -- both the "HD" and "Comfort" versions of their shocks.
Tried out the HD versions first --- and found that the control/stability of the van was AWESOME. But also found that for the weight of my van (came in at 7000 pounds even, without gear), they were too stiff. Van was pretty punishing over bumps. It was like riding in a military transport if you hit any kind of quick speed bumps. I decided they carried too many trade-offs to live with. (It often felt like the rear wheels, in particular, were "skipping" off the ground when hitting a bump....accompanied by a rough "SLAM" to the chassis.....)
So out those HD shocks came.....and in their place went the "Comfort" version -- which I had shied away from at first, because it conjured images of a floaty, mushy motorhome for retirees in Florida (no offense, Florida retirees....
) --- but i tell you what, these shocks are great for this size/weight van. Not quite as sharp-handling, to be sure, but they've been fantastic for long trips and for eating up the bumps when driving off-road as well. I would NOT call 'em mushy or floaty. Just composed and compliant.
Bilstein does have an awesome "return 'em if you don't like the ride quality" policy, which made this all possible.....so that's worth a lot for sure.
Just another data point for you, as you evaluate the options.