Very interesting tactic Ben. Congrats to you and your beautiful bride. I think you are doing the right thing by discussing this with your beloved.

BUT, I would counsel against putting that type of list on the fridge, where your feeble excuses for an upgrade of your gear will greet her everyday and remind her that instead of putting a shared goal, or even better yet, something she wants on the fridge, to remind her how much you love and think about her everyday.

Sure get the new camera, but just do it, don't publish your plans. I have found that talking about a replacement piece of equipment, justifying the expense and saying it needs to be done before we go away, includes your beloved and sets a due date for the aquisition. Don't leave a money trail in front of her nose for her to read and fester over. Discuss and just get it done.

As for your gear selections, you would love a 5D3 for sure. I have a 24 and a 35mm prime and on FF, I really prefer the 35 as a walk around lens, or even a 50mm.

Good luck with your plans.