If you're looking for realism, the Baikal Makarov is at the top of the tree.
I like the G17 Gen 4 too as it too is very realistic but it is not made from the same firearms grade parts the Mak is made from. Yes it's a blowback and the Mak isn't but I find that Maks tend to shoot to point of aim or near offer, whereas the G17 requires several inches of aim off.
I'm a Glock fan too and prefer the pellet firing Gen 3 over the other Glocks for range use, once the trigger has worn in a bit (and they do).
John