For fall hunting in the lower 48, I'm using a Marmot Helium bag (900 down---15 degree) that weighs 1 lb 13 oz. and is comfortable for my 6 foot 225 lb size. I also have a custom Feathered Friends 850 down expedition overbag that weighs about 2 lbs. I've had it down to 11 degrees on its own but it is built roomy and designed to have a bag like the Marmot inside it for extreme winter cold. I have found the two-bag system pretty flexible.
For Alaska and other moist country, I have used a North Face Snowshoe 5 degree Polarguard 3D synthetic bag, mentioned by another poster. Over the last 5 years the insulation has deteriorated substantially and I consider it about a 25-30 degree bag now.
One of my friends has a Western Mountaineering down bag that is excellent. I have their down Flight Jacket, which weighs 12 oz in XL size and the warmth just beats the hell out of many down jackets that weigh twice as much. However, it is an ultralight item and not built for crashing through thornbushes!
I've used the Snow Peak Giga Power titanium stove a lot and like it. On BackpackingLight.com they explain how to build a wind shield that will get it to perform at least as well as the Jetboil. Snow Peak titanium cookware has also worked well for me.
For fall conditions I've used a Tarptent with the built in floor and vestibule. Extremely light and good wind resistance but not meant for really cold winter conditions.
One piece of Cabela's equipment about which I can definitely say good things is their two-man expedition tent, which I think they call an XPG or the like. It is not as light and sophisticated as the Biblers so it is for horse packing or river rafting rather than lightweight backpacking. A friend brought one on a river trip out of Bethel, AK, not too far off the Bering Sea. For over two weeks we got the hell beat out of us by about 4 severe storms in a row. That tent performed perfectly for around $200 (or less on sale). Extremely strong, stable, dry, etc.