One of the first pieces I sequenced was Holst's 'Jupiter'. Although I don't think the rendering was that great, it always seemed to attract more downloads than any of my other files. It was done using soundfonts. The attraction, I assume, is simply the music itself.
I recently decided to render it using GPO. The orchestra is very large: 2 piccolos, 2 flutes, 3 oboes, English Horn, 3 Clarinets, Bass Clarinet, 3 Bassoons, Double Bassoon, 6 French Horns, 4 Trumpets, 2 Tenor Trombones, Bass Trombone, Tenor Tuba (Euphonium ?), Bass Tuba, Percussion, Harp, Strings.
I hope you enjoy it.