you guys got my wheels turning on the bottom situation :)
my original thought was that the cap 1's would be used for sleep (the R1's would be too warm) and on the trail on the under Rock Guides if it was really cold, the R1 ones would be pulled over the Guides at camp
now I'm thinking maybe ditch the Rock Guides (although the DWR on them is great) altogether, wear the R1's for hiking- add Cap 1's at camp, use Cap 1's for sleep
another option would be ditch the Cap 1's for me, as I tend to sleep hot and unless very cold probably wouldn't use them for sleep and once hiking probably wouldn't need anything underneath- in this scenario I wouldn't leave my wife's at home- she sleeps cooler and I think would like the Cap 1's for sleep and might even ear them in addition to the R1's at camp
to add to the confusion I do have some MB windpants (as does my wife) that could also possibly be entered into the fray :)