Jim, George, Brian, Phil, thanks for relaying your knowledge. I learned that choosing a bivy with attached bug netting is preferable.. for now I'm stuck with my Montbell goretex wide/long bivy at 9oz. I will try to find a light external net.
Phil, that Pro is one expensive poncho! I ordered the Golite poncho in blue after reading all this, and I will pair that with a Gossamer Gear ground sheet, the MB bivy, and the net.
This will be for solo trips only; with the swarms of mosquitoes, biting black flies, black ants, leeches dropping from trees, ticks, lice, oreo sized spiders, snake sized earthworms, etc, here in Japan there is no way my GF would sleep outside a zipped tent. And it's tough for me to work up the courage to try it also!