Hello, i am wanting to boost the signal from my guitar into my 17" MBP. I am using garage band 3. I have done some research and from what I can tell I need a preamp to boost the signal to line level. OK. I am good with that. After looking around I am pretty much sold on the products by ART. There are four in particular that appeal to me and they are all in the ART tube MP Project series. a: ART-Tube-MP-Professional-Mic-PreampProcessor $44 b: Art Tube MP Project Series USB $99 c: Art Tube MP studie V3 $69 d: ART-Tube-MP-Project-Series-Tube-MicrophoneInstrument-Preamp $65Out Out of all of these I thought I was most intrigued by the studio V3, that is until I called around my local shops and one clerk told me about the USB version. He said this was better since it bypassed the sound card. So my questions are this: !) Does anyone use any of these and do you like them 2) Is there a grain of truth to the USB claim the clerk made? Thanks for your thougts.