I currently use the "East West/Quantum Leap Symphonic Orchestra Gold Edition" which is 16/44.1. I record everything to PT (Mac) at 24/48. From what I understand the "EW/QL Symphonic Orchestra Platinum Edition" is 24/48 and has twice the amount of sounds, and better mic placements.
For those of you who made the jump from Gold to Platinum, was it worth it? I've been told the Vienna Symphonic Library is also stellar, but I don't want to get into Gigastudio.