As much as that's an option you can get royally screwed in this state getting caught with what they call post-ban mags. The chances of ever getting caught with them are slim, but when the outcome is major fines, possible jail time, and getting my license revoked for life, than risk isn't really worth it when I still have access to pre-bans. I already have a Beretta M9A1 which I have a few pre-ban 15rd mags for, but the ergonomics on that gun isn't any better than Glock's. Pretty much the most common handguns in this state you can get pre-bans for are Beretta 92/M9's, Sig 229's/226's, Glock's, and Ruger P-series.
Before anyone says move, if the choice is unlimited access to high capacity mags, or being close to my family and friends, ill choose the later.
All that aside I am going to have to track down a 17 and try it out again and bring my buddy along with his 19 so I can compare the two.