I'm no expert, but I've learned a bit. I have a Detroit Locker as part of a Super35 kit.
Be careful if you go the Eaton route (Detroit Locker, Detroit Truetrac) based on what you have written.
The Detroit Truetrac is a helical gear limited slip differential, not a full locker. The Detroit Locker is a full locker and is more comparable to the others you have listed. The Truetrac may serve your purposes just fine, but you need to know what you are getting. There is also the Detroit E-Z Locker which is a lunchbox locker like the Aussie, whereas the Detroit Locker is a full carrier.
That brings up the concept of lunchbox lockers... They are installed inside of the differential carrier. They replace your spider gears and can be pretty easily installed and removed.
The other kind of lockers are full carriers, which means they replace your differential carrier and mate up to your ring gear. It is going to be a serious job to install them, but they are also going to add some beef to your differential internals. Someone who knows how to set up gears should do this kind of install.