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The K&K Pure Mini is great. I put one in a guitar of mine I used to have. It will give great acoustic sound no matter which amp you decide on.
I have the Tonewood Amp. It is great for adding effects without having to plug into a bunch of equipment, and just uses the guitar body. It doesn’t really amplify the sound; but you can plug it into an acoustic amp also if you wanted to.
Look for used if you don’t want to invest a lot to start, or not sure what you want. I found a great deal from someone locally on a used Epiphone acoustic amp which is great to mess around with.