How about these hammocks?
Hennessy Expedition Hammock - 1.2 kg total wt (a lighter version availble for 0.8 kg). You don't require a sleeping pad saving you additional weight over a bivy. As long as you can find 2 trees 20' apart you are in good shape. The suspended tarp will keep those bugs away and help with ventillation.
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I don't own one but have been seriously thinking about it. Here is a review:
http://outdoors-magazine.com/s_article.php?id_article=170
I do own one and am very satisfied with it. It is pretty compact and with a ultra light air mattress and sleeping bag I have used it down to freezing temperatures.
KR