Kendall, I use the NRS Hydroskin socks. As I mention in the original article, 3mm neoprene (which the Boundary socks are made of) is much too warm for anything approaching normal hiking.
As for winter stream crossings, it has to get pretty darn cold before the wool liner and Hydroskin setup fails me. You have to keep moving to generate heat, and some might find this too cold or temporarily too miserable.
You can find open water, and especially overflow (ice sinks in a stream causing water to flow on top of it), at very cold temperatures, such that getting your feet wet might be dangerous. Alaska Ultrasport racers (the human powered iditarod) have used Wiggy's waders for years (http://wiggys.com/category.cfm?category=3) which are very similar to what Ike has been talking about. On the other hand Luc Mehl, three time winner of the Alaska Mountain Ski Classic, told me he and his partners just use plastic ski boots with thermo liners and get wet. Dump the water out and keep moving and your feet will be fine, apparently, even below zero. Thermo liners are heat molded closed-cell foam so they absorb no water.
I own Neos Trekkers, and they work great for sauntering through slush to the coffee shop or shoveling the driveway. Certainly waterproof. Not breathable at all, so you'd need to wear a vapor barrier liner to keep your insulating socks and shoes from getting soaked by sweat. Most seriously, in my view, are the soles, which have poor traction and are too floppy for serious hiking.



