My understanding of the Lock-right is that it is like a limted slip, and not a true locker.
The Detriot locker has 2 drawbacks. 1) it will be harsh for a daily driver, and on road conditions; 2) and unless I am mistaken, you'll need to replace the differential housing for the Detriot Locker to fit.

Currently, ARB makes the only true locker that doesn't require a replacement of the diff housing, and Eaton is coming out with a electronic locker (sometime, who knows when) but that may or may not require a diff housing replacement also.
Downsides to the ARB are cost, and that you'll need to install compressor, and if you do that, you might as well go with the tanks and install an on board air system as well (it is worth it if you decide to go the air route).

Personally, I'll probably get the LSD for the front before I go with lockers, but that does depend on what lockers I get. I'd like to go with electronic lockers, depending on when the lockers become availible and how much they cost. However, I am thinking about going with an onboard air system, and if I do that, it makes it worthwhile for me to install ARB lockers.