Dan (Wakkjob) helped me put the CBI bumper on my wife's 4th gen 4Runner. Pain in the ass. It's a great bumper though. Not to sound negative or anything, but you'll most likely pay more than $2500 for it if you get Armorology to build it, and they only build it in house on that specific vehicle. Another great shop in the area is Rock Ware. About the same price as Armorology. Rock Ware makes some sick shit.
Oh on a side note, I don't know what you have in the way of suspension, but we had the medium OME rear coils on my wife's 4Runner and after the CBI rear bumper we had to go to the heavy OME's.
2001 Tacoma, slightly modified