Try an aussie locker. They are a lunchbox locker but they work really really smooth. Almost no torque steer, even in snow and ice.
As for the install: pretty easy really, just take the diff apart and follow directions. Everything goes back in the same as it came out when youre done installing the locker in the carrier. The hardest thing is getting the danged center housing out from under the truck. It weighs enough for two people but there is only room for one!
Durability: Yes, I have broken CV axles with 33s and a front locker, but if you drive smart, without testasterone, which I assume you can do since you are a girl, you should be OK! Besides, CV axles are cheap from the junkyard and my wife can replace one on the trail in about 35 minutes.
An ARB is also a good option except for the outrageous price tag. The only drawback to an ARB is this: Everybody, I mean EVERYBODY I ever wheeled with who had an ARB has had issues on the trai with their air lines getting snagged, or just leaking from somewhere, or the compressor not running... which leaves you out in the bush or up a trail with NO FRONT LOCKER. This has really been a liability in super deep snow, where 3 wheel drive won't cut it.
Sorry I'm not a girl, but my wife is a better driver than me on th trail anyway, so I think that makes it OK.
Wheel On!