Just to add two more to consider, in addition to the Springfield (XD and XDm) since you're looking at polymer pisols: The S&W M&MP line and the FNH FNP line.
I think it comes down to what you feel comfortable holding, as well as if the safety features are needed for your experience level.
Personally, I don't like Glocks -- I never enjoyed shooting them, and don't like the trigger safety.
For carrying, I went with a nice IWB (I have a Crossbreed Supertuck) than an OWB holster, (and never go with it just in your waistband!), and I've been happy and comfortable when carrying my 5906, which is quite heavy compared to the pistols you're looking at.
mir