I've seen Opus 1 still arround, but it seems that they are phasing it out of existence. The new Vienna Special Edition replaces both Opus 1 and 2 and adds a bunch more instruments as well as the vienna instruments sampler engine. Looks pretty fierce, and then demos sound good. Two price points to enterr from- $445 for the first library, and an additional $600 for the second. There is a seller on line that I've been going to for years in the US that is advertising the first library for $399 introductory through April 15th. But I believe the rules of the site forbid me mentioning the site exactly.
I'm gonna get the VSE soon- I've had the opus 1 for years and the upgrade price is good. Normally, I hate using a new interface, (the sampler engine), but this sounds eally good.