I'm going to be putting my money behind XL426 post 558, it's my local Vulcan and should be able to make that glorious noise for many decades to come for a modest amount of funding. As previously said jets are my thing but I don't think getting anything post 1960 flying is going to be cost effective or even possible. Tornado to the Sky anyone, I can't see it happening.
So put your money behind Just Jane or a Shackleton if you want to see something interesting in the sky. Or like me support a taxi able Vulcan or Victor. Your money will go a long way and you'll get up close and personal far more than at an airshow.