I know you said not Dalaran because of the lag, BUT....

The inkeeper in the sewers has to be the best bind spot in the game, imo. He sells food and drink, obviously, but 5 steps next to him is a mailbox, guild vault and bank, all clickable from one spot. There is also the pipe that leads outside where you can mount up and fly out. Also, the ramp up into the city comes out at the Violet Citadel and a few steps to all the portals.

There is a reagent vendor and repair guy down there too, not far from the innkeeper.

I find the lag down in the sewers to be MUCH better than up-top. You should at least give it a shot.