Gonna need to go out on a limb...
Many guitarists prefer to keep what they buy, in hopes of collecting one (or more) of each model.
My personal feeling is that if your ears like something better than what you currently play, you're not married to the guitars. You can sell them for something else.
If your S2 Mira doesn't have that tone or sound you like, you're not obligated to keep it. Someone else will happily buy your used piece if you offer them a respectable and fair price.
That being said, Reverb's brand new and mint prices are not comparable to many retailers' new prices. It's a seller's market for new items these days, and you'll need to price competitively a used piece.
Other than that, if you've got disposable income, no outstanding CC bills, no mortgage, a loving wife and no kids in college, keep the S2, buy what your ears like, and apologize to no one else but remember that your wife will ask if you made a choice or not.