I have a Model 915 that I absolutely love. I love it so much in fact, that I'm thinking of trading my Sig P250 for another 3rd Gen S&W. The Sig has 2 barrels, one in .40 S&W and one in .357 Sig., 3 13 round mags, nice plastic case and original docs. I like the Model 4566, or maybe another full size 3rd Gen in 9mm. I guess my question is, should I trade the Sig or keep it? if I do trade it, what should I ask for in trade? What would the trade value be? My P250 is in excellent shape btw. Any assistance would be greatly appreciated. So far I am really liking the 3rd Gen koolaid! Just as a point of reference, I traded a 4th Gen Glock 22 for the Sig.