I think Newwegg has the best prices plus you can get a lot of info from the reviews. For that coverage you want a good N600 router and a range extender' routers; http://www.newegg.com/Wireless-Routers/SubCategory/ID-145 range extenders; http://www.newegg.com/Wireless-Range-Extender-Media-Bridge/SubCategory/ID-2948?Tid=17195