Good Free MIDI Orchestra Program?

Hi, all! I am a drummer and I have two friends that are guitarists and bassists. We like to get together and jam to some metal, but we're trying to stay away from the heavier side of metal (Death Metal and such...) Recently, I heard some symphonic metal. Particulary bands like Epica and Nightwish. I heard them and really liked their sound and thought it would be neat to make music like that. Only problem is, I don't have Bill Gates' money so I can't go out and buy as random orchestra. LOL! So, I am wondering if you guys know any good MIDI programs like FL Studio or LMMS that are preferably free and designed for orchestra and symphony? If you need any more detail, please ask and I'll add it into the extra details. Thank you!