The lunchbox lockers that don't require changing the ring gear carrier are a good option, they just replace the stock spider gears. These are the LockRight, EZ Locker, Aussie, and PowerTrax NoSlip. A true Detroit Locker will replace the carrier and require that the gears be professionally setup. The true Detroit can be a handful on the road, causing unexpected lane changes when you let off the gas and the locker unlocks and unloads. The lunchbox lockers are a little more road friendly but aren't quite as bulletproof.
Don't worry about getting a selectable locker in the front (ARB, OX) since you have lockable hubs. The selectable lockers are very expensive and better suited to those who do not have lockouts and the front axleshafts spin all the time.
A rear locker is going to be hard on the rear axleshafts if you still have the 2-piece shafts, so consider installing the 1piece axleshafts at the same time.
I run Lincoln Lockers in the front and rear of my YJ, onroad and off, so that'd be my opinion on the best lockers. Well, best next to spools :twisted: