I would like to thank everyone who offered solutions to my question.
Like in most other endeavors, one must deal with compromises. Now it's pretty much up to me to find something that does the job without costing too much or weighing too much.
My ten year-old Six Moon Designs Europa II weighs 33 oz (925 gm), blocks mozzies, and provides rain protection.
I was looking to give up rain protection (always risky even on the eastern side of the Oregon Cascades) and gain a view of the night stars in exchange for less weight and smaller packed size.
I gotta say that of the various products out there, only the Golite Shangri-La Nest at 16 oz (450 gm) looked to be an attractive option, esp. because it comes with an integral ground sheet in its price and weight, but they are now "temporarily out of stock."
Drat.
This is one of the few times that I've missed out on a sale due to tardiness; my usual pattern is to jump at the first thing that looks like it's even a close fit.
The other option that seems a fit is the Coghlan's Hiker's Mosquito Net (example: http://www.campmor.com/outdoor/gear/Product___86660) and add a ground sheet. Looks like it would suffice. And at 5 oz (140 g) I should be able to drum up a ground sheet that will keep me under a pound (450 g).
What's a good 8 oz (225 g) ground sheet suitably sized for one guy?