I had a Detroit Locker in the rear of my previous (stolen) '97 TJ (No-Slip locker up front) and selectable Rubicon lockers in my replacement '04 TJ. While the ARB is a superb (!) selectable locker that will hold up to pretty much anything, I sure do miss my bulletproof brainless Detroit Locker that just plain worked and didn't make me push any buttons. I don't mind having to engage my selectable lockers but dang it, that Detroit Locker just did everything without any problem. And it was great on the street too. I put something like 120k miles on it.
If you really want an ARB, that's the best selectable locker going. I would stick with the standard ARB compressor though and leave it for use only to power the locker. Get a second compressor for airing up your tires. Also, don't be tempted to go with ARB's heavier air line, not even ARB recommends it (read their FAQ section). The standard duty air hose is plenty strong enough but its benefit is that if it ever should get snagged, it will pop and leave easily spliced clean ends that can be spliced back together in about two seconds using ARB's splice kit. Their heavier air lines are more likely to tear out a fitting which would probably not be repairable on the trail. Just have the installer run the air lines properly so there is no danger of them getting snagged on the trail. A competent ARB installer shouldn't have to be asked to route them up out of the way however.
Unless you live where it gets icy, I would at least consider the venerable "bulletproof" Detroit Locker. It's a great locker that will take pretty much anything you can dish out to it... and you don't have to think about anything. Point and shoot.