Speaking from experience( I am not an electrician although my brother is and he helped me considerably):
Run flex throught the walls everywhere and anywhere you are even considering running wires. If you do not use some of them so what? Put a blank plate over the boxes.
If you opt out on flex in some areas, say for the Cat6 and just run it through the drilled studs, put protector plates on both sides of every stud where the wire runs through the stud. They are small steel plates that will make sure no one can drive a drywall screw into your wires. If you get a screw in a wire you will play hell trying to find it and drink way too much alcohol trying to locate the short. Hope this helps, John
Run flex throught the walls everywhere and anywhere you are even considering running wires. If you do not use some of them so what? Put a blank plate over the boxes.
If you opt out on flex in some areas, say for the Cat6 and just run it through the drilled studs, put protector plates on both sides of every stud where the wire runs through the stud. They are small steel plates that will make sure no one can drive a drywall screw into your wires. If you get a screw in a wire you will play hell trying to find it and drink way too much alcohol trying to locate the short. Hope this helps, John