I record a 300 piece chorus every year with 2 AKG C1000s mics. I run them in stereo through a Mackie 1202VLZ mixer direct to mini disk, then I transfer to CD at home in my studio.
8 mics are not nessesary unless you are featuring solos.
Everyone, and everything I listen to is my teacher. Every instrument, every voice, every sound in nature ... they are all my private tutor ... 24/7 for free.