Prog rules... Tiesto is kind of borderline though, his older stuff was much more uplifting, but the newer stuff (e.g. his remix of innocente) is headin much more progressive. This is probably because thats the way things over here in the UK (where he has his residency) are going.
I would define progressive as something with a different, new vibe to it. It goes much deeper into your mind i think, it doesnt really have the big synth riffs that have become so much of a trademark of trance over the past few years. Progressive i would say is a much more subtle form of trance, it usually has a lot more variation in the beat more than the synths n stuff, the one person i would say who defines progressive trance in the music he makes is James Holden (yes i know i go on about this dood soooooooo much, but no-one except infinity seems to recognise him), his beats and melodies are just so fresh and new sounding, the basslines are much more driving, and the production involved is just on a completely different level to anyone else i know, bar tiesto Prog generally has that driving feeling to it (i dont know if u know what i mean, but thats the best word i can think of to describe it) and it can span from deep deep nick warren stuff up to kinda uplifting, but still prog (to know what i mean here, get Ambassador - One Of These Days), so its a variable genre, but u always know a progressive tune when u hear it!
We've had so many threads in here trying to define progressive trance, and it really is hard to describe, so im gonna post a sample of what i think is the defining tune of prog. It is of course a James Holden Remix... Mad Dogz - Better Make Room, enjoy 
Peace
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