I use A rune UI addon called Rune Watch
http://www.wowinterface.com/download...RuneWatch.html
Player frames UI called Spartan UI
http://www.wowinterface.com/download...SpartanUI.html
And a HUD UI called IceHUD
http://www.wowinterface.com/download...49-IceHUD.html
My reasoning is that your runes are so important to your classes ability to funciton smoothly that it is beneficial to have more than one display of runes on your screen. While not wanting to make it confusing i deliberatly position 3 displays of runes in different areas of my screen that so no matter where im looking i can easily understand where my runes are at