Thanks for the suggestions. Although I usually convince myself that I just HAVE to have the best available (i.e. $$$) -- it just ain't always true.
So I took your advice and bought an Equinox bivy which (if it arrives in time) I'll test out this weekend. Now if bivys aren't for me, I only have to explain $60 to my lovely spouse.
And if I DO like the bivy experience (and I hope I do), then maybe in a year or so I'll upgrade to a BMW, MLD, or Montbell solution.
For this trip, I'll take my old, heavy, and too large flat tarp (heck, my Tarptent is lighter than this thing ;-)
Thanks for the suggestions.