1070 best GPU for the money and performance.. You're asking a question like this i the beginning of 2017.. we have no idea what other insane cards might come out, faster and cheaper.. but if its a must to get one just get a 1060 for now.. or even a 1050ti... dont spend too much money its still...
@Soapy i formatted it from windows itself :P windows 10 gives you the option to format your pc 100% and installs windows back for you once its done formatting the pc :D its a pretty awesome thing they added.
You do not need a password nor the launcher :) the launcher was removed ages ago i recall and theres another server now the old one is now the dev server thats the one you're probably trying to join.