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I am currently level 44
keep this in mind because you posted a lvl 70 spec :P
assume you are going to respec when you hit 70, because things change a bit. a lot of the comments in this thread seem to be more targeted toward tanking at 70.
i remember doing instances at your level, and rage was always at a premium - i can't remember ever tanking pre-outlands stuff and having enough rage to use HS. likewise, i really enjoyed imp. shield bash even though i dropped in from my spec at 70 (no spell reflect at 44). you should not need imp taunt at all.
consider waiting until lvl 50 to respec, unless you plan to spend most of your 40's in instances. soloing sucks without devastate.
try this at 44 next, fill vitality and devastate, then switch to arms for deflection and imp. TC, come back for shield mastery, finish off toughness, then get cruelty.
once you hit 70, you should have a feel for what kind of spec you like, and you'll probably end up testing a few of them.