Yah. The heat this past few weeks has been terrible. However, having to wear a suit every day allows me to carry pretty much anything.The X-Carry is part of the Carry size of the 320 line. The Carry and X-Carry are basically a Commander, full size grip/slightly shorter barrel. Same 17 round capacity as the Full size.
The X-5 is the upgraded version of the P320 Full size(that you looked at).
With the 320 series, you just have to choose barrel length. The grip modules -17/15/12 rounds can be changed. I mostly use the Carry size but for summer(you know how hot it has been here), I switch to the Compact or sometimes the Subcompact.
I looked up the X series and I noticed they have the plate for mounting an MRDS. This could change things a bit because I am also looking to get into the MRDS game.
Have you tried one on yours?