ISC N1 coilovers here. I wanted the ability to lower the car to my taste and not be limited to the height of springs. Overall very pleased with them. However, I have debated putting stock springs/struts back on for the winter, as the coilovers are very stiff and I didn't want them rusting up. However, I have kept them on so far, and get around just fine.
When you lower the vehicle, you WILL be plowing more snow in the winter (obviously). Whether you care about that or not is up to.
I'm not sure any other problems you would run into with lowering springs just because it's winter time in Alaska..? More prone to high centering if you're not careful?