Prot and mana?
1. Use Judgement on CD.
2. Take Consecration off your bars. Just take it out. Sure, it's hypothetically useful in some builds, in some situations, but the rest of the time (99%) it's just a big old liability.
3. Pray for more dodges and blocks.
Conversely, Consecration is a mana hog; if you want to use it beyond level 40 or so with some regularity, you may want to drop a point in Hallowed Ground (two points in Hallowed Ground are generally not required, though). Consecration is not a core ability for AE tanking (if only because of its cooldown); it is something that is primarily used in streaming/spawning adds situations or if you need to REALLY push your AE threat (which is rare enough). For most regular pulls, you don't need to touch the ability.
That being said, I haven't had any issues with mana. It's pretty sexy. I get to be lazy and now I don't have to worry about DP cooldown. :D
The only time I've run out of mana lately has been spamming exorcism on elementals yesterday. It was that or get near a ton of elites I didn't feel like cleaning up. And even then, Divine Plea took care of the gap.
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