An aussie locker is a lunchbox locker.

C.J. has an aussie in the front on his cj5, I don't think he's had any trouble with it. I had a powertrax in the rear of my 8.8 which worked well until I got 38's.

Everyone will tell you to go with different setups but you're the one dropping the cash so you have to make the final decision. Full detroits are nice but expensive, if you have the money and don't plan on swapping axles then go for it. An aussie, ez locker, powertrax, or other lunchbox would work great with your setup and not break the bank but that's just my opinion.