Buying G6, Fusion or Aura?

I am purchasing (financing) a used vehicle and was wondering if anyone had any advice on which choice I would be happier with and also witch is least likely to have problems. I know that's almost impossible without seeing the cars though. I am looking at a 2007 Saturn Aura XR with 110,000 miles, a 2006 Pontiac G6 GTP with 87,000 or a 2008 Ford Fusion SE with 98,000 miles, Thanks for any advice!