A locker will get you stuck and a winch will pull you outWhere are you finding these locked rears? I looked for about a month locally and on ebay and couldn't find anything. Every one was a unit with an open rear labeled as "locking rear" or the yard refused to take a picture of the locker switch in the dash. I found one I think but it was rusty as hell and was around $800, that's why I even started looking at Lokkas.
As for the winch I agree, I'd probably be better with that, maybe. At this point I don't want to have that extra weight on the front end with my AHC ( I already have a bumper) until I upgrade the suspension (when the AHC fails)
I think I'd rather have a locked rear and not get stuck in the first place ( or be a lot less likely to) than deal with having to winch out, but I will eventually add a winch.
Try Benzeenauto out of Sacramento CA area. They shipped mine complete with the locker for $500. It was completely rust free and they give you some warranty too: Genuine OEM Toyota Land Cruiser 1999 Axle Housing online. Benzeen Auto Parts.