Well I am no expert at all but like to tinker. I have a VERY basic setup (XP Home computer - standard Avance AC97 soundcard - 2Ghz computer - Reaper software - VERY cheap microphones - and it has the two mics mixed through an old tape recorder!) but the guitar sound that I get is reasonably clear for what cost basically nothing.

This is a little clip of something I am working on at the moment that might make you go "well mine sounds much better than THAT". It's recorded with a couple of mics and has a little compression and reverb thrown in afterwards. Excuse the mistakes and squeaks but as I said it's something in progress - it should stream from this link : Acoustic guitar (on listening again it has too much reverb on it as well as too many errors :)!)