I was lucky enough to dive the Thistlegorm as a night dive Xmas eve 2003, just me and my buddy, no other divers on it. Still access that memory when I´me having a less then perfect day. I would also put the Dresden class light cruiser Koln above the Markgraf as it didn´t turn turtle on the way down, and is still pretty intact.
Wrecks are personaly subjective and a top ten will be different whoever you ask, very like cave systems, which is where I do most of my diving now as I´m living in sunny Mexico. Wrecks round here are pretty poor to say the least but the caves are out of this world. still do find myself drifting off to some wreck dive in the the English channel in 2 ft vis though, you can only have so much unlimited vis.