I can never find enough specific detail on the BestBuy site to figure out what the differences are. They can be subtle like smaller (less expensive) battery packs or no USB phone charging option, no Bluetooth, no WiDi, etc.
It looks like your best deal might be from Toshiba Direct.Toshiba Portege R835 13.3-inch Core i3 Laptop
They have the R835 Core i3 model for $680. It does have all the nice options like all day battery pack, Bluetooth 3.0, WiDi and Sleep & Charge (charging a phone, MP3 player, etc)Toshiba Portege R835-P56X Review
not an identical model, but close enough to get a good idea about the features and chassis.