if you do more street driving than offroading but still want the extra capability that a locker gives, a selectable is a great choice, if you can afford it. dont get an OX, the lockers are great but theres been a lot of trouble with the cable mechanism. a friend of mine hooked up a pneumatic actuator for it and it works 100 times better now. but back to the subject. detroit has an electra trac, i have another friend with that and he enjoys it, works flawlessley, i think, havent heard him complain. and i have many other jeep buddies with arb's and they love them to death. the only thing about an arb is that you have to set up the air compressor and stuff. lunch box lockers are good also, but theyre engaged all the time and are noisy when they disengage for corners. standard detroit locker is another option but i dont think you want that