Here's the deal...I have the opportunity to get another glock at well below retail (less than $500 NIB with night sights). Should I get another 23 (the only glock I have presently is a 23) or add a 27 to the collection? Also, this weapon would be for car carry (and other options if the 27...like CCW). I love the 23 and like the idea of having the same set-up for home defense and in the car if the SHTF. Thoughts on the selection and if car carry is a good idea (I travel via the car a lot and have a CC license). Thanks in advance!!!!