Perhaps it will be too small, but I was going to offer up the Ford Focus ZX5 - rounded back wagon. The nicest looking Focus IMO, and perhaps the quality issues are worked out?
A4 Avant is a beauty, but still smallish in the back.
My top picks here would be Mazda 6 Wagon, Forester, Perhaps a good deal (depending on timing) on the soon to be remodelled Passat Wagon.