Congratulations hiheelsonly!!
I always go for Naturalizer when I need heels, they make their shoes so they give support and they usually feel great on the feet. Check out Vinney in white leather with a 2 1/4" heel--a bit lower than your usual preference, but still quite stunning.
I can't post links or images yet, but these are on naturalizer dot com under dress shoes.
Then there's my back-up, Easy Spirit; Lavena in white leather or silver is quite nice...of course, this is all speculative to your taste!!! Try looking for it under dress shoes on easyspirit dot com
And if you are wearing a white lace dress, here are some white lace shoes. These are actually flats, though. Still, they'd be comfy, and if they match...it could be a match made in heaven! Just like we hope your marriage is
Try natashascafe dot com and click on the White shoes on their color wheel, the white lace will be there.
Best wishes!
Zarah