Does anyone have advice on a microphone for a i7 iMac? Should I got USB or line-in? Also, would I be better off with condenser or dynamic? Does the i7 iMac even support line-in? If so, would I need some type of amp to increase the sound gain on the mic? I plan to use it for podcasts, voiceovers, and just playing around in Garage Band/Logic Studio. Any advice or even suggestions on a microphone are greatly appreciated.