Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
I would pick up and i5 and stick with the 760 for now. You might have to turn some settings down but it will good enough for 1080p and a new CPU will give you a massive performance boost in a lot of games.
Yeah you can solo all the old content with no problem. I believe you can't do it at 80 due to the stat squish they did a while back. I haven't played wow in a couple years though.