Hello again... So I am trying to pick out a sleeping bag, I have narrowed it down to these four: 1. Marmot Pinnacle +15 2. Northface hightail +15 3. Mountian hardwear phantom +15 4. Golite adrenaline +20 I am a cold sleeper and I am not buyung a bag without a loft of atleast 800... do any of you have experience with the above bags?