I like the Stuart Gordon turnover, very nice. Dingle's handling of it, though only vaguely different is also worth noting.
I like to take a double from the middle for switching out cards.
Really, it's a question of turning a double the same way you would a single. i used to do the Dingle pushover double, but found that I was only doing it on a double. Talk about telegraphing your method!
I now use a simple pushover get ready and a book turnover. Though, that said, I am trying to learn the strike double.
CL