Crazyredneck, the Eaton E-Locker is a good locker but it's open when unlocked, it has no LSD. Perhaps you're thinking of the clutch-based ECTED which does have a LSD when unlocked. ELocker Differentials
Stevie, I'm a big fan of automatic lockers and that's what I run in my TJ... a Detroit Locker in the front and a Powertrax No-Slip, both of which are automatics. But since you say you'll be on slick ice and snow-covered roads, I'd only go for a selectable locker so it can be open when on slick road surfaces and only locked when you're offroad. An automatic locker is not a good choice for icy or snow-covered streets, you'd likely not enjoy how it would be more challenging to drive on such surfaces to avoid skidding and sliding if you were't attentive all the time.
The Eaton E-Locke would be a good choice, so would the ARB Air Locker if it's not too expensive for you. Some love the Ox Locker but I'm not a fan of its cable actuated mechanism.
BUT if your offroading doesn't consist of terrain that causes tires to lift entirely up off the terrain, a Detroit Truetrac limited slip differetial would be fine and excellent on slick ice or snow-covered streets. The Truetrac act like an open differential most of the time and only goes into operation when one side starts spinning. It's also a full-carrier device so it is very strong and known to be just about bulletproof. Neither does it need a friction modifier additive to work properly like your present Tracloc does.