It doesn't seem like marrying any other NPC is worth the bother. They all give you crap. What's the best items you've gotten from Lady Grey or any other wife?
Oh! I did get a flame augmentation or two when I was married to the old woman (the one from Rose Cottage that you can only marry if you do the quest about the Hobbe's Cave where you rescue her son).
It was really funny to woo an old woman with the hero.
Anyway I noticed this Elixer of Life I got from Lady Grey isn't listed in the item archive. Sorry I don't have proof of it. I'll take a screenie if I can get her to give it to me again on the PC version.