Anyone know if the new Gen 4 Glock all have a smaller grip with the optional larger back straps?
Yes, I personally felt it made enough of a difference that I bought my first glock 17. It was a tremendous difference to me, especially when shooting back to back with a friend's 17. On paper, the difference is tiiiiiiny. In person, it feels much different.
In regards to your post, the gen4 model with interchangeable backstraps is only available in the G17 and G22. It will soon be released in the G19 and G23, but that is all I am aware of. The 17, 22, 19 and 23 can be had in 3rd Gen but with the newer RTF2 finish, nut I am not aware of it being on other models. The rest of the lineup will remain regular, old Glocks. Some Glock aficionados can correct me if I am wrong.
You can get a G20SF, though. I have zero experience even fondling a G20 in the showroom so I can't advise you about it.
You know, Glock should really update their website. It really isn't that hard. 1000's of other companies do it. Did they fire their IT web guy?
Edit:: My vote is for the FiveseveN. It's your birthday, surprise yourself with something unique! The Glock is nice, but nothing especially noteworthy to me, other than scratching the 10mm itch.