First of all, I completely disagree with the opinion that the G19 is not a lot different than a G26. The G26 is, IMHO, the ideal carry piece for most occasions. The G19 is GREAT, and I own one. You can pull it off as a concealed carry piece, but the G26 is a much nicer fit.
I have a G17 because I'd like to do some competition shooting in the future. But, I consider the greatest pairing of all time to be the G19 and G26. The G17 is great, but there's nothing it can do that my G19 can not.