Need input on a carry gun for warmer months.

I am new to the ccw community and I am in the market for a smaller pistol to carry. I currently have a full size XD9 with a PRP ultimate trigger, I do have an AG iwb holster for it but as it is a larger firearm I am concerned about carrying it in the warmer months (I am from 45-ish mins south of Chicago). I have shot the XDs, shield, g26, g43, and i would like to shoot the P320 sc and the cz p07 but I havent gotten to do that yet. I liked the Shield and both of the Glocks but I am open to suggestions. Budget is in the $400-500 range (holster included). Can anyone here give some insight into the P320 and P07 comparison? Thanks via /r/CCW http://ift.tt/2kLTBu0