Do you have an automatic tranny? If so, get a Detroit for the rear. It's not a daily driver, so you don't have to worry about it around town every day.
I had an Auburn for a couple of years in my 8.25. It's a good unit. It was great onroad and provided a lot of traction offroad. But, as everybody knows, a limited slip will always let you down when you need it most. If you really need a front locker, just lock the back, too. The Auburn is a full carrier replacement diff, and it's an expensive install due to the required grinding of the 8.25 case. You don't want to be disappointed in your $700 differential.
I now have a Detroit. It can be a PITA around town, but out on the highway and on winding mountain roads (I live in Colorado), there is zero, and I mean zero, difference compared to the Auburn. In fact, it is better in the snow, because it just stays locked. I found the Auburn could be unpredictable from time to time. I wouldn't put in a Detroit for a rig that sees a lot of daily driver miles, but for a mountain rig, I absolutely love it, and offroad there is no comparison for hardcore wheeling.
Limited slips are for daily driven rigs. For a wheeler, you won't regret the locker, and as long as you have an auto tranny, you won't know the difference even on twisty two lane roads.
Nay