Variance(?): I want to purchase a firearm

[MasterLJ]

I'm thinking about a Glock 20 (10mm KERPOW!@!!!), or possibly one of the .38 models.

Any handgun enthusiasts with suggestions?

I have a young son (5) that is with me every weekend, but next week he is moving out of state, so for the next few years I will be going there to visit. At any rate, he will be with me during the summers... so suggestions on how to keep the weapon secured would also be nice.