Congrats! My wife got me a 300m for our wedding day gift!
It's a Chinese tradition (or so I have been told...Or made up? No... Told, definitely told) that you exchange watches with your partner on your wedding day. The symbolism is that the watch signifies how long your love will last.
Giving a "cheap" watch shows that you don't expect your love to last very long because "cheap" watches break easily. Giving an "expensive" watch shows that your love will last forever because "expensive" watches are built to last. And that boys and girls is how I got my first Omega watch.
Good luck to you in your new adventure as a married couple! Congrats again!