By the way: I'm glad no one said that "you'll get the OEM lockers for free", because in most cases I'm seeing, that ain't true.
Now, this is mostly anecdotal evidence, HOWEVER I did do a little statistics on eBay sales, and for the past 6 months, FZJ-80s with lockers sold for a whopping $1800 more than those without! Some caveats: in many cases I couldn't tell whether it had lockers or not, so I excluded those. In some cases they didn't say, but I could tell by the photos that they did or didn't so I included those appropriately. And, in cases where they said they did (or did not) have it, but there was not photo evidence, I accepted their word.
I've also noticed, when I called people with FZJ80's for sale, that the ones that had lockers sold much more quickly (and hence, in general, for a higher price), than those that didn't.
As time goes on, I think this will become more and more true, and therefore the ARB decision will become easier and easier to make. That is, the cost of adding ARBs won't be much more than the additional cost of finding one with OEM lockers. Of course, with OEMs the chance always remains that you'll find a little old lady who doesn't know what the switch means and so you get it 'for free'. But as I mentioned, often even if they are ignorant, they soon figure it out by the questions they get asked when called.
My two cents,
Kenton