Update 2021 - I am currently using two stereo matched Vanguard Audio Labs V1 small diaphragm condenser microphones, with a hypercardioid capsule at the 12th fret and the Lolli Capsule at the bridge.
Previously, I was using the sE Electronics VR2 ribbon but I was never satisfied with the sound. I may consider using it as a tertiary mic or consider a different ribbon (such as AEA or Royer 121+) as the tertiary mic, a bit further away, in the center.
For my interface I was using a RME Babyface Pro FS but have since moved to an Antelope Audio Discrete 4 Synergy Core.
Here is a recent sound sample (w/ EQ+FX):
I've casually been browsing microphones for recording acoustic guitar for a couple years. As my musical voice has developed, and my investment in the craft and instruments has also followed I've been more and more compelled to be able to get good gear. From what I currently have heard I believe a stereo pair of SDCs and/or a single SDC and some other larger diaphragm microphone or Ribbon microphone would be what I would like to experiment with. Having a supporting audio interface is a different conversation but likely an easier piece of gear to buy and I do have some options in mind.
Below are the microphones that I've been considering which I believe are generally in intermediate-upper price point range though theres some above (e.g. Gefell) and below (e.g. Lewitt). Some very high end makers like DPA or Schoeps are included for reference. I intentionally excluded Rode and the NT5 - it's not for me. I also left some of the more low-mid intermediate but well competing options like the Peluso CEMCC-6, Studio Projects C4, or the Avantone CK-1 as I think I want a step up from those. This is based on my research framed around steel string fingerstyle guitar, but I also play nylon and other instruments so versatility in application is also appreciated.
I'm also aware that the videos are not particularly scientific way of comparing microphones and there is great variability and a plethora of factors that change the sound of a mic from one recording to another or in head to head comparisons between and across videos.
M300 - this is a more expensive German microphone (~$700/ea), probably in the same class as the Neumann KM184. This feels out of my price range but I've included it as a reference point as I'm drawn to the sound. I learned about this mic through Michael Watt's work which is what he uses to record a lot of his music. https://www.soundonsound.com/reviews/microtech-gefell-m300 . Here is an article where Michael talks about how he records - https://michaelwattsguitar.com/blogs/blog/posts/video-how-i-record-acoustic-guitars
The MC930 is a german microphone that I've really been attracted to the sound. To my ears it doesn't feel very flat / neutral and a bit colored but I like the coloring, at least in the demos I've heard I found it to have a rich sound. This is a bit more expensive at around $500 / ea (but I have seen deals for stereo matched pairs at $750). https://north-america.beyerdynamic.com/mc-930.html . I'm very keen on these mics. I think for fingerstyle, fingerpicking they will be excellent. I've seen some consensus that they don't do as well for strumming which I don't really do that much.
There is also the MC950 but I am less familiar. I believe it has a different polar pattern and I have not seen it mentioned for fingerstyle.
Maneli Jamal who looked at these frequency responses found the high end frequency bump to seem pretty dramatic.
Tuomas Kourula from https://newcenturyguitar.com/ used the MC930 for classical for a while but returned them and uses two VR2s on classical now.