I see the added trouble here that this was supposed to be a thoughtful gift. If your wife is anything like mine, she probably already feels bad about it not being what she thought she was getting/what you wanted.
As I moved into vintage and more expensive Omegas I thinned out the junk I had before. The prize of my small collection is still a beautiful rose gold Sturhling that my wife bought me. Not because it is the nicest piece, most comfortable, readable, expensive or attractive - but because it was from her.
I say talk him down on the 321 and have a piece your wife bought (albeit with a little guidance). From the sounds of it he will discount it - maybe show some recently sold eBay listings. Once it is all done - forget about the price paid and just love the heck out of it (and your kind wife for thinking of you).