I purchased a 5165 earlier this year, I would have preferred the 5167, but my dealer didn't have one and it was a week before the first price increase of the year so I took the 5165.
I had two other pieces on order which I was not going to get for awhile, and the Aquanaut was on my list to pick up later, so I snapped it up before the price went up. That being said I am very happy to have the 5165. I think it's a huge improvement from the previous aquanaut, and I find myself wearing it almost all the time. It's durable, casual, and does not draw a lot of attention, but it is as finely crafted and finished as any other watch I own.
Good Luck.