Relative newbie... bought a Glock 17 (Gen 4) a few months ago and i have been having fun with it at the range. Since i want to own 2 Glock pistols (for home defense, woods, carry, range fun, and even a potential SHTF scenario) I have 1 more Glock to pick up and am having quite a tough time figuring out what direction to go with this??? (10mm, or .40SW or maybe even another 9mm??) I do understand the tradeoffs on ammo availability/cost, etc... I understand that 9mm and 40 is pretty much always available, etc. I've read a lot about the 10mm and love the concept and the longer, flatter trajectory of the round. When i saw Vickers on TacTv use a Glock 20 to hit a target from 250 yards - that made a pretty big impression on me. (not that i would ever be able to do it - but the range was very impressive) However - i've read great things about the G22 and the guy at my local gun shop tells me not to bother with a G20. (know he's trying to be helpful - but it's hard to take him seriously though) The other kicker is that the G20 is not yet available in the 4th Gen... so i would be looking at a G20sf (3G)... which i don't know if that's a huge deal or not just yet. So i keep going back and forth b/c in my mind i see the G20 as a cool option b/c of the drop in .40 barrels - i could essentially have 2 guns in 1. (both a 10mm and a .40SW) I'd love to get some thoughts from some of you more seasoned guys out there. Let me know what you think so that i don't have to go broke by buying 5 more Glocks!!