Jaime and Jason are my faves.
Ryan is alright too, but didn't really get the run Blue Beetle and Firestorm did.
I'd also throw in the revamped Vibe as well. His title was a heap of fun and I was bummed when he faded into obscurity.
The one that really didn't work for me at all was Simon Baz. Although he was fleshed out more later, his introduction fell flat for me.