For a start, your link doesn't work But beyond that your gear looks fairly solid for pre-raid/heroics. be.imba isn't reliable for tanks for reasons mentioned in other threads around here (it says 490 def is a hard cap and expertise is capped at 5.6% reduction, both of which are wrong).
I would swap your green trinket for the one from Blackheart the Inciter in SL if you see it drop. This would give you some more flexibility in choosing enchants and some more passive avoidance (ie, you don't have to use the trinket to get it). Apart from that, swap your +def enchants for stam as your gear improves (but not before, uncrittability > anything else) and you'll be golden. Keep hitting those heroics, pick up badge gear, et cetera.
Also, giggity @ your avatar.