Budget, Performance, Silence - pick 2.
You're asking AMD vs Intel, want a quiet mITX build and are musing about a 1080/ti on a $1800 budget. I think that you will need to make some sacrifices from this initial stance.
Initial comments:
AMD 2600X for value compared to similarly priced Intel and longer-term socket compatibility, + decent included air cooler. Overclocking is moot with Ryzen and XFR2.
Loque Ghost is a boutique case and will eat into your budget. You may want to go with a more mass-produced case to preserve your budget.
1080/ti will be more power-hungry, hotter, noisier and expensive (over a third of your budget) than even a 1070/ti, so unless you really need to push that many pixels (and can afford a monitor that will require that kind of horsepower) I'd be selecting your GPU more carefully. The 1060 and possibly 1070 open cooler cards have probably better air cooling in small cases with high air turnover than blower cards and some even run passively under modest loads.
Watercooling erodes the value proposition for the 2600X a bit due to the included air cooler, and increases the size of the case you initially need to buy vs. just an air cooler to fit the rads and fans.
