I actually got to Celldweller through his instrumental work. As some people might know, I'm an instrumental rock fanboy, and through that genre I found his first Soundtrack for the Voices in my Head, which I liked. From there I found Wish Upon a Blackstar. I still listen to that album in instrumental form instead of vocal form (I don't like some of the language he uses), it's still awesome either way. Birthright is my favorite from that one and might be my favorite song of all time, Louder than Words and Best it's Gonna Get are both serious ear worms for me, and It Makes No Difference Who We Are and The Lucky One are for some reason nostalgic to me.
I like End of an Empire as well, and like you (or "Just Like You"?) the title track is my favorite. But I also like the "faction" tracks, 02, 05 and 06 all have awesome music, and the "conversation" in 06 is interesting. Although I haven't heard all of Chapter 3 yet it seems like Faction 08 will be equally awesome, and I'm waiting to hear how the story unfolds in 07 and 09.