OK, so now that I've reached level 80 I want to play in the grownup dungeons, specifically lich king heroics and cataclysm. The AI won't let me 'cuz my gear's too low (it want 180 for LKH, I'm at 176. I'm obviously not going to bridge the gap by questing.
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So now what - just keep running the biggest dungeons it will allow and hope I get lucky on the equipment drops?