That's what I'm doing now..

At the moment I've got my both my wow's on one screen, where one runs 21 fps (Main wow with max graphics) and one runs with 31 fps (2nd wow with only view distance set to max, everything else is down to the bottom. Both wows are on 1280x1024 because that's the default resolution of both my monitors, and it looks smoother that way.

But I've decided to just run them together for now, and find a program similar to keyclone (Don't wanna pay for something like that right now), and have my alternate wow in the background, with default follow keys etc..

I'm using Netherwing dailies for practice, so the place isn't too crowded..