In NJ YOU could have had a 19 and it would have met the 15-round magazine size until the Progressives that are weak on VIOLENT CRIMINALS decided to continue to harrass law-abiding Americans, instead. But, additionally, it is generally thought of as more versatile as easier to conceal, etc. I personally prefer the subjective feel and balance of the 19 over the 17. I would imagine you cannot go wrong with either. Plus the 19 will also take 17 round magazines where the Constitution means something, and if you move to a more free place, then you will already have practice with a more concealable firearm and own one. I prefer shooting the full size M&P over the Compacts but like them all none the less. A 9mm revolver might also be fun if you can find one. You could probably get two S&W M&Ps for the price of one of those other guns you own/mentioned. The thin Glock 19... I forget the number, might also be a nice investment. Have you handled a Beretta 92 variety?