Hands down, get an Aussie locker, they are the best "lunchbox" style locker you can get. They are pretty quiet, and almost none of the quirks of the other ones. I had a lockright that would always pop and bang, it was just horrible. And no locker will unlock under power, if power is going to it in a turn it will stay locked. They only unlock around corners or u-turns when you are coasting. Otherwise whats the point of a locker if it unlocks when you are trying to go?
If your worried about running a locker on snow and ice, don't put one up front!! That is unless you never plan on using 4wd on slippery roads. with a locker up front and the jeep in 4wd on slippery snow covered roads you won't be able to turn. Even in 2wd with a non disco axle you need some sort of traction to get the locker to unlock. Plus the D30 is even weaker than the D35...
I ran a TJ on 33's for a while with D30/35 with an aussie in the rear, and never had any issues. But everyone said it would blow up so I upgraded to a 8.8 again with an aussie. And as for the snow issue, I live in Michigan, we get snow. If you know how to drive a rear wheel drive vehicle a locked rear is no big deal at all. If you give it gas around a corner you'll kick the back end out, if you dont give it gas it won't kick out on you...
Now I run a HP 3/4 D44 front with an aussie, and D70 rear welded on 37" tires... zero issues with the aussie locker...