Pass on those Nexens too - made in China, and beware the Icebears, Hankook (and Kumho too) now makes some of their tires there. Check the sidewall before buying.
I have the General Arctic Altimax. While Continental has targetted these towards the low end of the price scale, they are actually an older design they originally sold as the Gislaved Nordfrost 3, considered among the best when they were new. In the Gislaved line, this was replaced by the Nordfrost 5, but the older design lives on in under the General marque, and is still an excellent tire. Performance seems to be comparable to the Blizzak WS-60 or X-Ice Xi2, which is better seems to depend on who's comments you listen to, but they are priced far lower than the Bridgestones and Michelins. I've used the older Blizzak WS-50, and find I'm preferring the Arctic Altimax.
The Firestone Winterforce are a good choice too, but I have no first hand experience with them. Performance probably isn't as good as the top tier winter tires though.