I would say if you are truly interested in the best quad core (non i7 build), you should go with the Phenom II X4 940 like you had at one point. I would also get that core contact cooler even if you are not overclocking because it will help keep things even cooler. Doing basic overclocking is not hard at all and will bring you good gains.
So if I were you, that's what I would do. Use the 720 build, just switch the CPU for the X4 940.
Also, any of these will be able to max out WoW and almost any other game up to 1920x1200 resolution.