I traded in a 2005 Subaru WRX STi which I bought new after months of research. It was terrible. I've had the RDX a month and it's an extraordinary vehicle. For someone w/ low back problems the driver's seat/position is perfect, unlike the poor seat in the Toyota RAV 4. I'll check back in a few months.
Comfort, handling, predicability, build quality, hands-free nav system.
Stay away from dealer contracts mandating binding arbitration. Get the Honda clean diesel or some other fuel efficient engine. You've got the technology, just do it.