Couple of comments, here.
1. If you want to play a guitar for other people in a bar situation, there is no substitute for a properly drilled, properly installed 1/4" jack. I know. I have tried to "baby" my two best guitars by temporarily installing a Baggs M1 in the soundhole, routing the cable up the bass side of the fretboard extension, across the back of the guitar and secured to the strap at the end pin. All in the interest of keeping them unmodified. In practice, it is a royal pain. The cord is too short to make it to the mixer, so you have to add a 1/4 to 1/4 coupler and plug the house into it. Too complicated for an open mic situation, easier to deal with if it is your show and you can insert a preamp into the signal chain at your feet. Plus, the cord has to be carried around with the guitar as you are setting up.
2. In this day and age, any depreciation in value due to the installation of a jack in an upscale acoustic is minimal. Modern players are moving away from mic'ing because of all of the complications (feedback, etc) that go with it. Plugged in and mixed is the way to go, if you want to play at a volume level that cuts through a noisy bar crowd. Life is too short for me to worry about whether I lose anything in value on a guitar because I put a pickup in it. In fact, Retro Rocker was thrilled that I had added a K&K to the F-50R I sold him, albeit it was a player to start with.
3. I favor a passive system in my guitar (K&K), with a matching K&K Pure preamp as close to the pickup in the signal chain as I can get it, no more than a foot of 1/4 cable to the preamp in my pocket or clipped to my strap.