Great and simple guide to follow.
It would be worth if you mention the dreaded "EnableULPS" setting for AMD Crossfire setup. People do have hard time with it. I personally am running ASUS HD7950 DCII with Sapphire HD7950 Dual-X and I get BSODs when I run the setup with EnableULPS set to 1 in registry.
CPU + Mobo :: Core i5 3570K + Asus Maximus V Formula
CPU Cooler :: Corsair H80
GFX :: Asus HD7950 Direct CUII + Sapphire HD7950 Dual-X
RAM :: GSkill TridentX 2400 CL10 16GB
Storage :: Corsair SSD - 60GB + Seagate Baracuda - 1TB
PSU :: Corsair AX 850
Cabinet :: Silverstone Raven RV03
Keyboard + Mouse :: Logitech G110 + Razer DeathAdder
Audio :: JBL Creature III + Razer Megalodon 7.1
Display :: AOC e2352Phz