Yes, I don't want to drag that one out of the grave again, I just couldn't help myself from trying to summarize all those threads into this:
When it comes to virtual orchestra sample libs;
EWQSL is the classic, perhaps somewhat outdated (2004).
Vienna VSL is the primary challenger (with others), to take over the scene.
Garritan GPO is the entry-level, bang-for-buck full orchestra.