http://users.forthnet.gr/ath/trident/starwars.mp3 if you like the above, (it comes from a midi file I found on the net) check Edirol HQ Orchestral VST synth.
Basically it is a sofware synth (VST), focusing only in orchestral sounds and it sounds nice. Needs a virtual "rack" to be installed on, like Brainspawn's Forte.
www.brainspawn.com Check the General arranger keyboard forum for posts from frank rosenthal, bluezplayer and rikkisbears to get an idea.