Rear leaf spring lowering options, ideas?

[dag19]

So there I was...lowering the front end of my pickup by a supposed 2" via a set of drop spindles with disc brakes. All went well on the installation. Measured it afterwards and I am pretty sure I got set of spindles that dropped that hummer by about 5 inches! So after looking at it I was satisfied with the look but needed to do something with the rearend.

The rearend has leaf springs. I put a 3" drop shackle on there and it still has a nasty rake. So now I want to go back and either put a set of lowering leaf springs on or put in some air bags. Which is the most economical, best ride, and easiest to do?