Here is a pretty substantial build that should boot fast, suit all your needs, and handle any higher end gaming you would like.
This is also on a Z270 series Mobo, so should you want to upgrade to RGB components or a better processor later all you would need is a CPU + AIO.
As for the sound card you mentioned in the OP, it has been proven time and time again that a sound card really doesn't produce any noticeable differences when gaming. Most of the testing i've seen done on youtube was also while wearing $300+ headsets which would definitely exceed your price cap.
https://pcpartpicker.com/list/HX8YqkYou will need to use the rebates and purchase Windows 10 Pro with an online code to stay underneath the $750 price cap though.
/e and no a static bracelet is not worth $10. Have built hundreds of PC's without a hiccup. Just don't put it together on the carpet or wear any materials that generate a lot of static in dry weather.
This post was edited by TpKd on Mar 12 2017 08:30pm