Not sure on the processor.
It is an i7, so won't suck, but 1.6ghz sounds slow.

Wow is not very graphically challenging, so the video card will likely be just fine.
Especially if you turn shadows off, and maybe view distance to medium on the slaves.
You can also have the slaves look down, which can help a lot.
You could easily make a mapped key, which is run on window: all without current, whenever you switch the active toon, so the others look down... just put a /script SetView(2);SetView(2) on that keybind, and save a top - down view.

8GB of Ram will be plenty.
You have a 64-bit OS, which is good.

If you can put an SSD in, that is an enormous boost.
Even a cheaper one, purely as the gaming folder.