Went to REI today and purchased the Cats Meow, synthetic fill 20f long bags for my wife and I ($169 each). We will initially be spending most of the beginning of our Backpacking careers in the sierras and initially Yosemite. We don't plan to be out any earlier than May, or later than September but elevation will vary. Considering this background and the fact that we will be using good inflatable's to sleep on, does this sound like a reasonable selection?