Well CTGunner, you say that the 19 feels the most comfortable in your hand and you shoot it as well as any of the others but you mostly shoot the 17 at the range and use the 26 for carry even though it's not the most comfortable your hand - I guess that would go for the 27 as well...and you don't shoot the 30 much either and don't carry it concealed...
So, going by what you say, it appears that you should keep the three 9s and sell the other two. You have the 17 for range or home use, the 19 for your favorite and the 26 that will conceal the best for carry...and they all use the same ammo...plus the 17 and 19 or 19 and 26 can fill-in for each other if something happens to the other...
I use these three Glocks myself but I find that the 17 and 26 actually fit my hand the best while my wife likes the feel of the 19...so, the 17 does duty as a home gun (with a Glock light attached) and sometimes as a duty pistol, the 19 is my wife's go to gun and for purse carry while the 26 is my concealed carry pistol (I just curl my little finger under the mag as my middle and ring finger lock the gun in my hand)...
I also like the G30, more so in the SF frame...but, settled on 1911's to launch my .45s...
So, there you have it...another opinion! ... but only your opinion matters!
Oh, for the benefit of the poll, I'd have to pick the 17 for a one and only for ME...