Again, thanks for all the suggestions. prague sounds might be something I get if only just because it's really cheap, and because it's soloists, which there seem to be less libraries of.
As for the others, orchestral tools sounds cool, although to get started with that you'd have to spend more -- with spitfire, for example, each library is no more than 400 pounds -- so what I might do is buy 3 or 4 of their libraries to get started, then buy more as time goes on. This would be more money efficient in the beginning, and would allow me to get up and running more quickly.
Speaking of buying a few at a time, are there any spitfire you'd recommend to start with? I was thinking albian 1, bml 1 (the first one on the page, I can't remember the name after bml
Thanks,
-Michael.