I'm looking for advice from others who backpack and/or camp in the winter. I've only been once, and I used a cheap synthetic sleeping bag with a rating at zero degrees Fahrenheit. The actual temperature was close to zero degrees, and that was the manufacturers rating, so... it was uncomfortably cold and I did not sleep well at all (you know how you wake up when you get too cold, and then have to warm up before going back to sleep).

So now I'm wanting to get a good down-filled winter sleeping bag sometime in the next 2 months. I'm having trouble finding EN ratings lower than zero (will keep looking, of course). I would need something that is similar to an EN rating of -10 degrees Fahrenheit (using today's EN ratings, not those from a few years ago that are 10 degrees off). It would be even better if it can be packed up quite small (I know, a tall order).

Does anyone have any advice for sleeping bags that could fit this? I figure they will probably run in the $600-$800 range, so I get that. I've also considered adding a liner for more warmth.