I've had front lockers on two vehicles for over 12 years. The lockers were stock in the rubi, ( which we sold 3 years ago ) and stock on our 80 series Landcruiser. We have wheeled in the backcountry all over the US and parts of eastern Canada. We've also wheeled in a few pay for play parks on blue/black trails in both the rigs. I can count on one hand the number of times that it might have been necessary to engage the front locker, so I engaged it. As time has gone on, I find myself much less inclined to engage it. I know that in the past 3 years with the 80 I've engaged the front lockers only very occasionally, and that is just to make sure it is working. Spend half the money you'd pay for an ARB locker + installation, and get a really good winch, winch accessories and a tire repair kit. I've actually used my winch many more times than I've used/needed the front locker..
If it were me, I'd go with 2.5" OME suspension, tires, sliders, winch. KISS, very simple, the less mods you have the less your chance of breakage. With those simple basic mods you can traverse 99% of all two tracks in north america. I wouldn't even consider a front locker... Welcome to the addiction !