mudmutt
Member
It'll be a smoother ride. I have the coils and very much disliked the feel of the air suspension during high speed turns, particularly during direction changes. Many like it, though, and the general consensus is that it was vastly improved on cars produced after the D announcement (which I don't think are any of these). I never felt like I really needed it, though I do generally need to be careful with inclines or it scrapes slightly. Then I moved and my driveway is REALLY steep, so it's tricky backing it out. Doable, but tricky.
Right around when mine was made was when the issues started getting sorted out. From what I've seen I kind of have an outlier and more problems than most. The nice thing about it being a CPO is that anything that comes up is covered for many years yet. But it's undoubtedly a hassle to get it into the SC for repair. If reducing the chance of visiting the SC is worth that $6k to you, I think you've narrowed your list to two (I'd kick out the high-mileage black 45xxx because of this position on the SC visits).
Just to add .02. I actually prefer the air suspension feel. Granted I got the P85+ so it has a different feel than standard air suspension as well as different than the springs only. While it's not as big of an issue for you, ride height is for me. I like to keep the car at a low ride height when possible, but there are times when snow here can be a hinderance and in my A8 I used this quite often to make winter driving easier. So I would say the height adjustment could be a consideration if the ride quality isn't as much of a concern.