+1 on the SP VTB1. I've had it for over 4 years and gotten some great sounds from it. You could also get a small mixer..like this.
Buy Peavey PV6 Mixer online at Musician's Friend
You can plug in two mics, pan one to the L and one to the R.....run stereo outs into your soundcard and viola!
If you only need one channel at a time though; just go for the vtb1 and use a stereo splitter or something to go out from it. Or, just record in mono.