Sorry but you are mistaken. She plays wow. So cpu > gpu. A gtx760 for example is very powerfull for wow and its still above higher than average for more gpu intensive games, say fps ones.
Now my take between the 2 builts, of flens and tenangrychicken's, is that if you dont go for an i3 and you go for i5 then you go for unlocked version. Since you will go for a haswell chip you are ultimately choosing between i3 4330 and i5 4670k. Both got 4 threads, and most of the times you get the i5 over i3 for gaming is to overclock.
Op says he wants to crossfire his wife pc. Doesnt make sense to do it for the games he mentioned, unless he already got a card himself, on his pc that he will upgrade and place that to his wife new rig. IF thats case, you should have mentioned what that gpu is
My 2c's