The one upscale wagon you didn't mention is an Audi. I suspect it falls to the same concerns you have about VW, BMW, et al. You'd likely want an A6 vs an A4 due to the tight rear seat. I drive an '07 A4, and at 6' 0" there isn't even enough room for our 10 year old behind the me. As a shorter driver you might be ok, but probably you'd still want the extra room of the A6, especially in a older model.
Personally, I love driving mine and the reliability records on TrueDelta show the A6 isn't much worse than the Subaru Legacy, and in some years even better. Yes, I find the repairs can be expensive when they occur, but I would rate my experience to say I think I have "about average" repair rate (you can see my repair histories here at True Delta by looking for a 2007 A4 Avant 2.0T from Vermont)
The only other real wagon I can think of is the Dodge Magnum, which I know nothing about.