Snag--
Mountain Gear has the single wall Black Diamond Firstlight on sale. 2 person, 3 lb, $225. Not suitable for major sustained rain, and not that cheap (well, $75 off list), but bugproof and windspray proof. Very good tent.
For woody areas, as wahoo points out, a hammock might be the ticket. There are a bunch of them, with Hennessey being one of the good choices. One I'm half-interested in the Jacks R Better Bear Mtn Bridge hammock; it lies flat:
http://216.83.168.206/index_files/BMBH.htm Note that with many hammocks the rainfly is extra $$ and weight. You don't need a ground cloth (though I use cheap and light Tyvek sheets for that), but you usually do need a pad under you for insulation purposes. Hammocks seem to be either a love it or hate it proposition.