I do the same thing as a Warrior tank except my second bar is composed of my wrath spenders, defiance, etc.

And if bar space is an issue for you, I would think about making a defensive CD macro (I have bloodbath, featherfoot, and foresight macroed together so I can rotate them) with /recast so you can keep track of downtimes. I know pallys might like to pick and choose their CD's because they aren't... well... bad, but it might be a something to think about.