Rosie, how do you decide which book you're going to read next?

Pretty much on how I'm feeling, nothing as awesome as Helen's way :) I'm always either in the mood for slash, fantasy, or YA, so I check out my GR to-read list. As for how I get that . . . well, it's a bit of a struggle since sometimes it feels like I've read all the good books and I'll never find another one again, but then a story comes along that's so perfect I don't lose faith. Other than trawling through GR lists, Melissa gives me a lot of suggestions too :D