I've got nearly 90k miles on my 2500 ram w/ limited slip and honestly I don't find the limited slip to be an issue on icy roads, and we have had our share the last few winters. My previous truck had an open diff. The bigger issue is the diesel engine and not much bed weight. I run studded tires in the winter and pop it into 4wd when things get real slick. If you do alot of winter driving you'll have to occasional pucker moments, but it's amazing how simply getting your foot off the gas will typically straighten everything out.
I wouldn't want a locking diff on icy roads, but limited slip is probably more of an asset than a detriment.
