Hi What is the best antivirus for the device? I want it to be very strong but not effect the performance as much as possible. I got Bitdefender Total Security 2015 free after rebate. Is it good? Any other suggestions? I go to a lot of dangerous sites so windows defender might not be enough? I need a case lie the insipid ones BUT I need the surface pro 3 dock work with it without removing the case. Plus if the rear surface pro leg works too will be good. Also light if possible. Any idea? (by the way, I don't use the external keyboard cover from Microsoft so I don't care about that) Much obliged.