I am sort of new to backpacking, have gone on a couple summer hikes and think I am ready to delve into some winter trips. I have a Kelty lightyear 25 degree down sleeping bag, but know that this alone will not suffice for the colder temperatures I will no doubt encounter. I am thinking about trying a quilt to put over my bag and was thinking about the western mountaineering version. I have never seen these used, only read about them here. How small do they pack? Is this the best method to try or should I just break down and buy a zero degree rated bag (I am a very cold sleeper). I most likely will be using a tent, however it is a floorless design, so then, my other question is groundcloth and sleeping pad. Currently, I use a Big Agnes REM aircore, which is great on warmer trips, but I am finding out that closed cell foam is the way to go in colder climates. Any recommendations I could get would be greatly appreciated. I don't want to freeze my tail off "experimenting" with different ideas.