I managed to get Hastral to 68 a few days ago, so i went to Northrend. He is 70 now and his alchemy is pretty high allready so i think its time for him to start making money. Hopefully the prices of flasks remain as high as they are now. Considering the patch is on the doorstep, they might even go higher.
He has no real trouble in Northrend at the moment, but he did have some unfortunate deaths do to disconnects. Howling Fjord is about half way done and then its on to Dragonblight i guess. I hear you can earn some nice XP in battlegrounds to so i might try that also.