I needed a portable rig so I have two Shure SM58's and an iMic, which is a USB break-out box (sort of). Shure mics are rock-solid and have great pick up, and the iMic is compact and clean and powered by the USB. You'll need an adapter to go from the mic's 1/4" plug into the iMic's 1/8" stereo jack, you can pick one up at Radio Shack. For mine, I got a Y-adapter so I can record two people at once, on different channels, which helps in mixdown. Might wanna get a mic stnd and a pop screen as well.Anyway, if you just need one SM58 and the iMic you'll prolly spend less than $100 and hve a clean, compact system.