Just to put my 2 cents in here. I would recommend starting with the 80 meter version. That version, with the correct filters will work on all bands. I bought the 40 meter one, and 80 meters has reduced output because the transformers are not designed to cover 80 meters. The filter designs are published, so you can easily build them for other bands.
As far as audio is concerned, I use the Startech USBAudio2D device. It has a stereo input, for the Xmit input audio and the IQ output. For the microphone in the speakers I use a Trechrise USB device. Beware however that many motherboards do not have the resources to support 4 usb audio devices. If you can use the audio on the motherboard, with the Startech it should be oK.
