PlanetZ forums - scopeusers.com

For the orchestra stuff, the pc is the best. Better to buy a new pc and a good sample library.

There is also WIVI Instruments for PC wich are NOT cumbersome sample-libraries but rather some form of Physical-Modelling. They sound good IMO and they won't use a lot of computer resources. WIVI has a very wide range of wind instruments, here's a link for info and demo - http://www.wallanderinstruments.com/