My 2 cents - I use a G17, SJC C-More mount, SJC 11 Port comp - SJC Magwell.
125Gr JHPs - 7.0 Gr. AutoComp - Makes major barely.
Shoots flat as you will ever get a Glock to shoot.
I can shoot Winchester White Box ammo from Wal-Mart just by changing the main spring and the gun runs fine. Not quit as flat through with the WWB factory ammo.
Did not have to spend a ton of money on the set-up. It is my first open gun and wanted to see how I liked it.
So far so good.
Also have a G35 that I use for limited class. Hadn't got around to making a load for it, so I use Atlanta Arms 40S&W.