Here is the spec i'm going with http://www.wowhead.com/?talent=j0vZ0xZfg0I0bogeoRcsut
While this thread is about the best tanking build, you also need to look at what is the best build to be able to go from tanking to grinding/farming to dpsing without respeccing. While i know this isn't one of the best builds for this, it works out perfectly for me. I don't take BCB for one glaring reason, in my rotation, i make 1 maybe 2 autoattacks, otherwise im either cycling rune or blasting with runic power. Without those multiple auto attacks, i see BCB as a was of talents point