I was wondering if anybody had some advice on sleeping bag systems that would work for a broad range of temperatures. I'd like to get some gear that could work between a solid 30 degrees and 70 degrees. I'm OK with solid but no frills gear and I'm hoping to keep things on the lighter side ~3 lbs since I'll use it for backpacking. Despite how marvelous a $500 dollar sleeping bag may be, I'll never spend that much. I'm a player between 150 and 200. I was looking at something like a Wiggys ultra light w/ a silk liner or a lower cost 30 deg. down bag (http://www.campmor.com/outdoor/gear/Product___37418) w/ a liner. I've done a bit of camping, but it was with older coleman bags. You'd freeze at the low temps, be comfortable in the mid temps, and roast in the warmer weather. I'm hoping that a bag and liner would be a good layering system that could cover the full range of temps. If others know otherwise ... Feedback would be greatly appreciated. Might as well scoop up some winter closeouts. FYI I'm 6'2" and 165 lbs, so it I'm usually on the colder side at low temps.