We've certainly changed directions since the first post. You were concerned with soundstage, and now we're trying to gain staging preamps and cloudlifters. I'm still curious about what type of soundstage or ambience you are looking to achieve. Do you want close mic and intimate, or something that sounds like you're on a small bar stage? Something in between? I still think you could do it with the 103, by trimming the highs with a LPF and maybe a bit of a nice reverb.
I've recorded acoustic guitar using only an SM57 into a Tascam interface, no extra boosting or preamps, and the noise was not a problem. It wasn't the sound that I wanted, but it wasn't unusable from a "technical" standpoint. Again, listening to your sample, I really couldn't tell anything about the system noise due to the ambient sounds intruding.
I'm curious as to what the guitar is that you are recording. What type of pickup system does it have?
If you have more than one input on your interface, I would record both ways and either pick one, or use a blend until you get the tone you want. For sure that's a reason I would never recommend something like a Focusrite Solo. Minimum 2 inputs, preferably 4 or 8.