Yes, we need to know what you have not in order to give the best advice.
What height suspension are you looking for too? Stock to 3.5" high?
But in addition to the Deaver choice, you could take any vendor's 11-leaf pack of the next height up, and remove a leaf or three to soften up the rear even more.
Add the Bilstein 5100's to that mix and you've got a pretty good setup.
But you will lose some of the spring's ability to carry extra loads, so keep that in mind.
At that point too, if you're trying for soft, then the anti-swaybars mentioned would be a welcome addition.
But don't forget tires in this equation either. If you're running 19" Load Range E tires at 70psi, you can forget about fiddling with just the suspension, as your tires are going to keep you feeling every pebble you run over.
Plenty of stuff to talk about still.
Paul