I'd do this..
https://pcpartpicker.com/list/CHskbXyour not oc'ing no point in getting k version or thermal paste, could even leave out after market cooler tbh, but I added it for looks/temps.
memory change only for aesthetics. case cheaper and same features for most part, PSU cheaper and better.
Maxed out fans for you, will have slightly more positive airflow to help with dust. windows 10 pro 64bit is 5$ on ebay for an OEM key.
1080ti is what you buy, though tbh I'd buy this used atm and save yourself easy 200+. cheaper mobo since you don't need to oc,
but need to retain memory speeds.