Hi,
I like my MXL 603 on acoustic guitar. I like my AT Pro 37 better. Just a little crisper or more detailed in the upper registers. Still both good.
I like my Naiants fine and choose them often especially when recording audio for video. I like them on a Jecklin Disc.
One mic that hasn't been mentioned is the AT 4054. This is a stage vocals condenser mic that has also found a home in many studios. It's great on vocals and also happens to be very good on acoustic guitar. I have gotten very good tracks pointing it straight up at the guitar while I stand and play above it.
Another good mic placement in over the shoulder near your ear pointing down at the guitar. I like this with my 603 or Pro37.
Dynamic omnis are great for recording
acoustic guitar because they can be placed really close without getting a proximity effect. Sometimes I work with a pair of omnis less than six inches from the guitar, one on the twelfth fret and one on the wood behind the soundhole. Stereo and everything.
Ok, now to the important stuff.
Even if I'm recording to my iRiver internal mic I always use a gobo when recording acoustic guitar. I made my own out of rigid fiberglass and burlap. It is just amazing what a gobo will do for your sound. Two's not too many. I use mics right in front of the gobo or peeking over the top. Or I just play into the gobo and mic one of the ways described above.
None of the mics I ever bought made as much difference as a good preamp. I use an M-Audio DMP2 which is about the least expensive quality preamp. It makes all my mics sound better. I have two and never record without them.
And most important is your playing. Practice. Make sure you're in tune. record yourself. Listen. If it sounds boomy maybe you should hit the bass strings a little softer. When recording I often play very soft. Much quieter than I could ever play live. If a string has a twang or a buzz control it with your fingers. To get good
acoustic guitar recordings you have to control your guitar and make it do what you want it to do. Iteration is the key. Record, listen, practice, record, etc.
And I don't mean generally. I mean on that part that you're working on recording right now. If it's not good enough it may be the mic or the mic placement and if while you are listening you get some ideas try them. But in the end you are going to have to play the part and make it sound the way you want it.
Thanks,
Hairy Larry