The Audio-Technica AT2020 USB (Amazon.com) is the USB-driven version of the AT2020. It’s a cardioid condenser microphone. Reviews frequently praise it over options like the Blue Yeti (Amazon.com), which comes in at a similar price-point. Audio-Technica has replaced the AT2020 USB with the Audio-Technica AT2020 USB+ (MSRP $149, Amazon.com).
If I were to do it all over again, I probably wouldn’t choose a cardioid condenser microphone.