Getting back on topic........
I vote for the A club ALWAYS! Best showers in the entire AA system, the gym is very nice, the AAngels are amazing! Also, plenty of computers.
I agree with the other poster:
1) go to the A club for a run/stairmaster followed by a shower (use all of the jets!)
2) take SkyLink over to D for a nice meal in a restaurant
3) go to the AC in D for relaxing/lounging/Internet/plane-spotting