I've noticed recently that Fry's Electronics in Austin has been selling their house brand (GQ - Great Quality) PC for $159. It's not currently on sale, so it's a good deal higher than that price today. I've wondered if it could be any good. ExtremeTech has tested it and you can see their full review. It did pretty well.
If you're not lucky enough to live close to a Fry's, you can pick it up at Outpost.Com. It's selling today for $269, but they have run it on sale cheaper than that online recently.