The main question I have would be, do you have a main team to fund your boe's ? I plan to have crafted bracers, belt boots and pants made the moment I hit 80 with all the crusader and runed orb gear ready to go at 80. It will be pretty expensive but I anticipate being able to farm at least a few heroics at the start. The BIGGEST thing is to over gear your tank first, this will make things much easier on you, with all the boe buyable stuff out there you can be up and running quicker than you think, provided you're willing to pug a few solo raids and farm the cash and mats for the boe's !

My 5 pally team is at lvl 72 now, when they hit 70 I took them into UK to try my first northrend dungeon, I got owned hard, leveled them to 71 and bought/had crafted the cobalt set pieces for all 5 and went back in. Mind you they all are in full boa gear + cobalt set, my second go was a cake walk.

All that tells you is a few upgrades will go a damn long way to your success. Try the boe route, get all the craftables you can get and pump up your tank. That's the best advice I can give