I vote for a small diaphragm condensor, like Shure SM81 (about $320), placed quite a bit away from the sound source (4 to 8 feet, perhaps). I've never recorded anything in that genre, so I'm of course just guessing here...
Omni would of course also work, but then your acoustic surrounding is even more important than with a cardioid mic. You probably also need to try different mic placements/positions, not just the distance, but also the angel.