Just wondering something.
3) 20+ addons ( custom Unit Frames, Auctioneer, recounts meters, addons that are huge resources hogs)
Why not only have that on your main? As, in my case, I mostly online have the main's window visible. Meaning that those addons'd be a waste of memory.

Another small thing, you might want to give Linux a try? Wine with WoW & Keyclone works perfectly. And you're getting a LOT more FPS than on Windhooz.