I like Geoff Johns alot. I'm still way way behind on most things(i've only just finished the Sinestro Corps), but I've liked how well he manages to fit obscure characters into a story and gives them a sense of meaning. Hmm... as for recommendations, gimme a sec, i'll go look at what I have.
Hmm. Come to think of it, I dont own much Geoff Johns stuff lol. If you want to get into Green Lantern, "Secret Origin" or "Rebirth" are good starting points. Superman "Up Up and Away" I also liked(written by Johns and Busiek).
But my personal favorite run by him was his Booster Gold run he did after 52. Pick that up and enjoy the ride