I have to disagree a comparable SUA to SOA would cost more like 1200.00 for parts and that would be RE's SUA 4.5 extreme lift YJ 4.5" EXTREME-DUTY KIT
here is a pic of it on a jeep w/ 35" tires
here is a SOA cj w/ 36" tires
here is another with a few more mods but same suspension
The biggest thing is a properly installed SOA lift is HARDER TO INSTALL this is where most people have issue because you actually have to think about what you are doing
an SOA will require the following at a basic level
spring perches 60.00
brake lines 80.00
the following would be needed for either suspension and won't be in any kit.
sye 200.00 can be run without I have done it but not for DD
antiwrap bar 150.00
close to the same price but when you want to upgrade it is easily adaptable and you won't be replacing the entire suspension. stock yj springs are give aways and they work great for SOA builds. You can get by cheaper by using a cherokee front drive shaft for the rear it will already have the double carden on it.
Labor is what will kill you on it but depending on your level of skill it might not be so bad.
here are a couple of flex shots from an SOA suspension
notice how in the second pic the jeep sits level here and the suspension moves with the axle that is hard to accomplish with a SUA lift. My friend with the rescue jeep above was always trying to figure out how to get his jeep to flex like mine, we could never get it to do so. You CAN'T get the same flex or ride out of a high arched spring as you can out of a low arch spring it just isn't possible with the weight ratio's of these jeeps.