I'll echo what the others have said. For IDPA and 3 gun shooting all that you need is a some good sights and a trigger job. Especially for the club level shoots that you mention I see a lot of shooters in ssp class that don't even bother with aftermarket sights or trigger work and shoot Glock 34, 17, and 19. It's close range rapid fire shooting and doesn't require anything special in a pistol. Definitely not a $2000 Glock. My personal 3 gun/IDPA gun is a Gock 17 that's stock other than a Ghost trigger job kit and Dawson sights.
mmhh Glock 17, i will hit the range this week end and will borrow one from a guy i know and i will get a few round through it to see its performance, then maybe...either way spending $2000 on a Glock is a No No.
