there is a small mixer from tapco/mackie blend6 with 6 line in, phantom power, 2 fx stereo loops, monitor etc.
i use it to feed the line6 guitar port with processed guitar, synths, drums etc. before routing to the pc via usb.
the pc soundcard is for output only and returns into the mixer also. the mixer runs with two mackie monitors and also has a powerful headphone amp.
the setup is perfect for low level recordings - and runs perfect for the budget. take a look here:
http://www.musik-service.de/Recording-Mischpult-Tapco-Blend-6-prx395751219de.aspx