I'd do the suspension first and see if you even need/want the extra body lift. Older Jeeps don't have 1/2 the wiring these JK's do.
Just try and install and ARB air compressor and you'll see first hand what I mean.
Looks like some creature ate a NASA satellite and barfed it up behind the dash.


A couple things to consider before installing the BL.

Theres alot of wires and hoses attached to the firewall and fenders that will come up while the engine stays in place.
Airbox,radiator,coolant tank, brake booster,ABS stuff and steering linkage too.

In the back there's emergency brake cables,fuel lines, charcoal canister,and who knows what else attached to both the body and frame. Any of the above may not have an extra 2" of slack.

Asthetically your bumpers will sit 2" below the body which might look wierd to you.

I talk to someone who's installed and driven with a body lift on a JK before unbolting the body on your new Jeep.