I have a Zeus vest, and it's nice and warm, but the jacket that I wear on a near daily basis is my North Face Redpoint with Primaloft. It was referred to me by a friend that guides in Antarctic, he used it as a mid layer, but I have found it good down to the negative teens as an outer layer and then still good to the positive 40's. I think the Primaloft does a better job of regulating core temperature than down. I think down is great for non-active events, but doesnt shed heat well during exercise. Also in wet winter weather Primaloft is great in gloves or mitts as it really does maintain warmth even when soaked.
00 Jeep Wrangler 4banger
Custom bumpers, Warn M12000, Heavy skidplates
Former Rock Junkie reformed to the Overland life.
07 Jeep Wrangler Unlimited
Custom bumper, Custom Rack, Superchips programmer, OME Heavy lift, AEV Correction brackets, Warn VR10K, Fox Shox, Michelins.