Something I learned is that "bucket list" bikes are generally not all they are made out to be. I eventually owned several of the bikes that were on my "bucket list", so to speak, and none of them turned out to be the game-changer I thought they would be. These included fully-loaded English roadsters, high level Cr-Mo Schwinn road bikes, complete and original pre-WWII bikes, pre-WWII rod brake roadsters, vintage club bikes with 531 tubing and dural parts, etc.
I've found the bikes I am most attached to have sentimental reasons (my grandfather's bike, or the bike I rode every day in college), or were unexpectedly good (a basic, 1947 3 speed Schwinn that is a lot of fun to ride) but never on any bucket list.
My experience is that what you're really looking for is not so much in any "bucket list bike", it's something inside of yourself that is brought out by a bike that you just enjoy riding, and that may not be on any list. Often, success takes the unexpected form.