In this video I review the pickup system that I use for my acoustic guitar. The guitar itself is a Martin D-35 which did not come with pickups installed.
Pickups: K&K Pure Western Mini pickups
These are transducer pickups. They attach (via glue) right under the bridge of the guitar (on the inside of body of the guitar – not under the saddle itself). This gives a much more accurate and natural tone than piezo pickups, which is what most acoustic guitar pickups are.
At under $100, these are a great pickup system for your acoustic.