I'm getting to that exact point myself. I was planning to go for glory of the hero, but some of the achievements require special group setups, so I'm left with the choice of levelling (and gearing) up another tank and slower or simply finish the last heroics that I haven't so far (oculus etc.), call it a day and focus on my main. I've got more money than I know what to do with (I simply refuse to spend 15k on a mammoth) and I have every single piece of gear from heroics and badges that I could want. My brother is levelling his team so once he gets 80 and some nice gear we might see how much of naxx-10 is doable.