If it's for your piece of mind, you might consider not having a round chambered. I recently purchased a Glock, and am getting used to it and the holster/how I feel comfortable carrying it. Since I am fiddling with it so much I have not had a round chambered when carrying.
While many will say this is not the ideal level of readiness, I have also been practicing racking the slide while drawing. Since I am not blistering on the draw as it is, it has not significantly slowed down my speed.
Also if you purchase a holster that properly covers the trigger/trigger guard, I don't see how you could possibly have an accidental discharge.
H