re: If you could only buy 1 more game the rest of this year...

Huh, I thought Witcher 3 was coming out in November. That was going to be my answer until I thought "better double check before I post".

Now I think my answer would probably be Warlords of Draenor. I don't still play wow, but I go back for 3-4 months every expansion, to explore and see what's new, then when I remember why I quit playing I cancel my sub and wait for the next expansion.