If your not editing photo
s/videos or playing games there is really no need to pay for a graphics card . you can spend your money on better RAM or CPU http://3xs.scan.co.uk/ConfigureSystem.asp?SystemID=1270 or slightly over your budget is http://3xs.scan.co.uk/ShowSystem.asp?SystemID=1271 , this one has a quad core CPU and plenty of RAM . Both come already loaded with windows & home premium 64 bit
Best Android apps 2015/2016: Best apps for your new phone or tablet - what apps should I download?