I hit 70 myself a little over a month ago, have yet to get into heroics/kara but feel like I'm close to ready.
Armory (if i'm in farming gear ignore, should update soon - I'll be buying the S1 shield and shoulders when S3 starts, Murmur was stingy with me as well)
First thing I did at 70 was work on faction reputation. Getting to revered with Aldor shouldn't be too hard, they have plenty of quests (the Area 52 chain in Netherstorm and quests from the altar in SMV helped me) as well as Marks of Sargeras and Fel Armaments that can be farmed or bought on the AH. At revered you can purchase
Vindicator's Hauberk. Also grab the shoulder inscription for dodge from the Aldor - if you want you can push on to exalted for an even better inscription and a great farming mainhand epic sword.
Running SV repeatedly for the Devilshark Cape might seem annoying, but it really is an excellent option that will last for a long time (it does have defense, dodge, shield block, and stamina - i mean, WOW). Also you'll be gaining CE rep, and can pick up
Strength of the Untamed at revered if you like. Less stam than what you're wearing, but the avoidance is nice.
Finally, revered with the good 'ol Keepers of Time pays off nicely. Doesn't take too many Old Hillsbrad and BM runs to get there and pick up
Timewarden's Leggings and a nifty
Glyph of the Defender for your head slot. Also a nice tanking ring drops in Old Hillsbrad, and BM has lots of goodies. BM is kind of ez mode for tanks anyhow; no multiple mob pulls to worry about.
One more HUGE upgrade is the
S1 shield, soon to be available for honor and marks. If you can get the defense and avoidance you need elsewhere, the armor, block, and stam from this baby in your shield slot is godly. (The resilience also lowers the defense value you need to achieve PVE "uncritability", don't want to be too technical here though.)
That's my advice, take it for what it's worth (as I said, I've got zero heroic and raid experience). Pick a handful of goals like these and when you start to burn out on one, switch it up. What's the point if it ain't fun? :D
Good luck and happy tanking!
Edited, Nov 18th 2007 5:16pm by WipesOnTrash