Las Quenas on the corner of Sherman Way and Bellaire in North Hollywood; Puro Sabor on Van Nuys Blvd. in, um, Van Nuys. Both are stunningly excellent. The actual ceviche itself is slightly -- SLIGHTLY -- better at Las Quenas but the accoutrements (choclo, cancha, potato and yam) are much better at Puro Sabor.
Las Quenas will do half-orders, too, and Puro Sabor doesn't.
12708 Sherman Way, North Hollywood, CA 91605
6366 Van Nuys Blvd, Van Nuys, CA 91401
lots of different styles of ceviche out there...but why not try Jonathon Gold's latest rec and new peruvian Mo Chica