I think the best way to do it is by going through the different stages of Hard Trance, for example this is how i relate to it - You have got the Old skool sound, then the sound off 98 - 2000/2001 (a good example is Marks mix off Brainstorm) then you have 2001 - 2004 (Hennes & Cold 'Second Trip' (Scot Remix) defining tune and creating that unique bassline), then 2005 - 09.

Then you could maybe get the ultimate winner but it would be so hard to do that, you would probably be best at most, doing the ultimate top 10/20....?