Buy the monitor first, then while you are waiting for other parts you can use that with your old laptop
The 380 performs better than the 960, but if you like the Nvidia features and tdp get that
you arent forgetting anything unless you need a keyboard + mice
Only get a wrist strap if you are in a carpet environment or area wiht lots of static
Probably dont need the thermal paste.
I have no experiance with CX psus but people will say that you shouldn use them. Honeslty I dont know.