Just another GR refugee. Other than that, I had a stroke in 2004, and read almost anything I can get my hands on, though I have a particular weakness for history, mystery, and historical fiction.
I'm going to name both two popular modern books that are marketed as YA (a Harry Potter and The Golden Compass - I recommend both series in total), and a book from my own adolescence that I enjoyed thoroughly that is probably YA (we didn't use the term then): Father's Arcane Daughter. All are fun reads, and recommended.
I think HP and HDM are well known to everyone these days, so I'll just say a word about Father's Arcane Daughter. It's by E.L. Konigsburg, and is narrated by "poor little rich boy" Winston Carmichael, who has smotheringly overprotective parents, a younger sister, Heidi, who has problems, and no life.
And then in 1952 his long-lost half-sister, Caroline, shows up from the dead (she was kidnapped and never found long before Winston or Heidi were ever born - one reason Winston's father is so overprotective), just in time to claim a large inheritance.
Is this woman *really* Caroline Carmichael? Where was she all those years? What are her real motives? What do Winston and Heidi have to do with it?
It was out of print for a while, but I think is back in print? I don't think many have read it (about 450 on GR), but it's a fine, strange novel.