Is your wife already 30? Is this the beginning of setting high expectations for every birthday or anniversary ending in 0 (or 5)? Does "we will work to make it happen" mean the money isn't sitting there waiting to be spent, with no other earmarked purpose, and all of your other financial goals have been met? Are you 100% out of debt?
In the past couple of years DH and I both turned 50. Being who we are now, we didn't have parties and we didn't do big gifts. The people we were at 30 definitely would have wanted to do big gifts, but at 30 we had a new baby and couldn't afford to spend money like that. I can't recall what I gave DH, and he gave me a digital camera, which of course became obsolete a long time ago. At 50 all we wanted was zero debt and financial independence, so we stayed with that goal, and achieved it when we paid off our mortgage this year. We're at the place where we can walk away whenever we want. Actually, I'm already FIREd, but DH enjoys his job (even more now that he can WFH).
From your post, it sounds like your wife will feel good about herself if she can give you something expensive, something that has WOW factor. It's common in people whose love language is gift giving, or even in people who were raised to equate big occasions with expensive gifts. I understand that she wants to celebrate your life, and I understand why she wouldn't want you to just add money to a VTSAX, but I think you need to discuss it more. Come up with a plan for now and for the future. Decide on an acceptable budget for milestone occasions. Make sure you both know why you're choosing to celebrate your life by spending money.
Not that I'm against spending money -- I just think it needs to have more meaning than being handed a blank check or buying something expensive for the sake of it being expensive. If there's something out there that will make your life better for having it (meaning it's something missing and useful, and your life is worse off without it), then set a budget and choose whatever that is. But understand that whatever you choose might not still be in your possession in a decade or two, so what you are buying is a memory.