When I built my first PC this monthly guide was great and very accurate, however recently it's been misleading at best. The r9 290 should have been in your under $300 recommendation. Here is a link for an Asus for 240 bucks. At that price point there is no way you should get a 960 or 280 instead of the 290.
http://pcpartpicker.com/part/asus-video-card-r9290dc2oc4gd5.
http://pcpartpicker.com/part/asus-video-card-r9290dc2oc4gd5.