Here's what I use:

http://www.engadget.com/rss.xml
http://feeds.gawker.com/gizmodo/full
http://www.hardware.fr/backend/news.xml
http://www.hardware.fr/backend/articles.xml

Hardware.fr items are often empty, with just the title. I think they're broken.

Engadget items are mostly complete I think, they just tend to be short on text, with large pictures.

Gizmodo items, despite the RSS link, are indeed truncated, with reduced picture, text, and some navigation menu Gifs. Somehow loading all that in GRead is the most problematic.

The silliest RSS feed I know of is this one. They just sort of dump their web site in it :-)
http://www.akihabaranews.com/fr/rss.html