solo acoustic (or classical) guitar is typically recorded with a stereo pair of mics. Many people favor the small diaphragm condensers for this because the smaller diaphragm responds quicker which yields better transient response and a more focused top end, albeit at the cost of a higher noise floor than a larger diaphragm.
Many great recordings were also made with a pair of large diaphragm mics (like U87s or C12s). The difference here is a slightly "smeared" top end (its the audio equivalent of a very gentle blur in Photoshop). That's because the larger diaphragm just can't react to the transients as quickly as smaller diaphragm. Oh those pesky immutable laws of physics
Buy within your budget, but buy at the top of your budget.
If I had all my mic buying to do over I'd start with buying fewer, but better mics from the get go and not having to unload a bunch of less expensive stuff to get the keepers.
HTH