Thanks, everyone. Lots of good suggestions here. Since I know that I sleep cold, I think I need a bag rated at least 32 deg F or below. I've been looking at journals on Crazy Guy on a Bike, and found a few comments from people wishing they had warmer bags. It makes sense to add a lightweight liner as well, which would accomplish 3 things: keep the bag cleaner, add warmth in cold weather, and be used by itself in hot weather.

I need to think about my sleeping pad, too. I have a Thermarest 3/4 length ultralight that is somewhere between 10 and 15 years old. It has a couple of patches but is still air tight. If I recall, it is less than an inch thick, and weighs just a shade less than a pound. It's from the era before the manufacturer figured out that non-slip is a good feature.

But on the sleeping bag side, I have a short list of options. A good down bag is a lot of money, but if it saves some nights in a hotel it can pay for itself. At least that's what I'm telling myself. Here's the list:

1- Western Mountaineering Aspen Hooded MF, 25 deg, full zipper, continuous baffles, 2 pounds. List price $310. Ouch. Most flexible, heavier than some other WM bags.
2- REI sub kilo, 20 deg, 2 pounds, list price $209.
3- North Face Kilo, 32 deg, 2.1 pounds, ~$150.
4- Mountain Hardware Phantom 32D, 1 lb 5 oz, $245.
5- Marmot Helium (30 deg, $320, 1 lb 5 oz) or Helium Women's (15 deg, $358, 1 lb 10 oz)

I expect to visit some stores to see how I fit into some of these, and then make a decision. And whatever I do, I'll have that warm hat ready to put on if I'm cold at night! Thanks, again. And please don't hesitate to add more comments.