I've heard the No-slip is a lot more street friendly - but the price is a little higher. Detroit has something similar out now, too, I'm looking into that.
Rear lockers tend to cause understeer under power - so while turning in snow, they push you out wider in the turn. Seems to me you should be in 4HI at that point, which should compensate. The Power Trac and Aussie are known for a lot of noise breaking in, and some report hearing them all the time in turns, which means they don't coast.
If you have enough skills to change a timing chain, you should be able to install a lunchbox locker if - IF - you don't have to pull the carrier for your specific vehicle. It gets more complicated for that, but it's better than grinding teeth off the ring gear.