What is the best microphone to buy for Skype and audio/videoconferencing use? It'll be running into an RME Fireface, I would like it to be compact and able to sit on a desk. It should have an on/off switch. Anything else I leave up to you. I'd like crystal clear, ideally fairly directional voice pickup. And if I am going to buy a separate Mic I might as well get a really good one. I'll set the maximum at $500.