Galoot wrote:I'm having a pickup put in my Johnson ...
Sorry, couldn't resist. The Fender looks like a pretty cool amp, but it's probably not optimal for amplification of an acoustic instrument. An acoustic guitar combo would be a better bet if you're concerned about accurate reproduction of the high harmonics of your resonator or Taylor (though the resonator would probably fare better through a standard amp than the Taylor).
Most electric guitar amps are pretty low-fi in terms of their frequency response. If you go that route, I'd advise you try before you buy to make sure the sound is what you're after (and if it is, more power to you). If what you want is an amp that's going to sound like what you hear playing unplugged only louder, an acoustic amp is the way to go for sure. There are a number available in the $200 range. Do a search for "acoustic guitar combo" and see what the user reviews (on retailer sites and elsewhere) have to say.