I just booked mine about a week or so ago so I was within the 30 day window of my trip. I don't think any of the times for those tours were completely booked up at that point so I think 45 days should do it. I am also a Disney Visa cardholder, mentioned that and was told that I could receive a 15% discount so the tour cost about $49 and I believe as your a DVC owner you will probably get a bigger discount so don't forget to mention it.
BTW - all of your family photos were cute, esp. the Mad Hatter and Alice ones.