All of these remixes, I have to say, are quite epic. That isn't a word I use lightly.
For 1, wow you just blew the source away with that one. Some of the softer parts remind me a lot of Requiem for a Dream/ Lux Aeterna. I hope that there's enough original source in here, because it's definitely an awesome track I'd like to see on the front page as well. The ending with Zeldas Lullaby just completes this.
I'm also quite fond of 4, love the Imperial March 'cameos'. Not entirely sure if they'll fly with the judges (especially that incredibly blatant one at the end), but I personally like them (as well as the rest of the piece, EPIC).
6 could be the sequel to 1, the ending of 1 is begging to set this up. The way you've created such an epic piece out of a simple little theme is absolutely brilliant.
Can't say I've played the games to recognize 2,3, or 6, so I'll refrain from commenting.
Overall, I'd say that 1 is the best, but 4 is my favorite
Great work guy, keep it up!