After looking at a few lightweight freestanding tents, (after reading emmceebee's post)I decided to just stick with the tarptent. I may postpone the trip a week or two though to ensure I don't hit Glacier NP too early. I haven't really looked at the maps to guestimate a loose itenerary yet. Either way, I don't think the relatively few days I may be sleeping at higher elevations warrants throwing down another $200 - $300. Aside from the 32 degree bag, I'm thinking about getting a bag liner, plus I have some running tights, a polypro pullover or fleece vest I could bring, wind/rain pants, wind/rain jacket, a pair of wool socks, microfiber balaclava, and I could bring my fleece earband and fleece neck gaiter (actually, they are just rings cut from the sleeve of an old fleece pullover). The tarptent packs down to nothing. I think the space/weight savings would be well worth a possible cooler night or two.