Good thoughts, thanks! :)
Thanks kschendel! I think that answers my question about the PSU.
Regarding the CPU, the prices I see in CAD are:
So that's why I went with the i7-7740X. But I guess that has forced me into high-cost motherboards? I'll take a better look into the performance of these options. I don't need many cores, but do need the fastest single core speeds possible and $100 or $200 difference doesn't matter much: This is for a build machine that is building one build at a time, mostly through software which generally only makes use of a single thread. It will not be used for any video output, but the motherboard I chose didn't have a video output so I needed an external card.
I've tweaked the fans to the values recommended by silentpcreview.com ... I would not call this case silent. It does a decent job of cooling, but does virtually nothing to keep the innards quiet. If I remember correctly, the Antec P100 was a quieter case and much nicer to work with in all other ways as well.
Just putting together the parts now. So far so good -- FT05 does seem fairly quiet so far, but I haven't tweaked fan speeds yet. This case looks like it will be a bit of a struggle for cable management, but that's more to do with its size , not the design. (it's not a massive case)
From what I can tell already, there is A LOT of airflow in this case. Normally, it's all being jetted out one little spot at the back of the case, but with this one, I can feel the air coming out evenly across the entire top of the case, with the exception of directly above the CPU fan, which has the most airflow. I should be able to get the fan speeds pretty slow and quiet with this design.
The ASRock Z170 doesn't seem to have any electronic noise -- but right now my CPU fan is spinning too loud 'cause it's running at 1.1k RPM or higher right now. Because I only have one graphics card right now, I'm using some of the free space where the expansion slots go to suspend the 2 extra USB 3.1 ports that would normally be mounted in the front 5.25" bay. This should mean I will have the full set of USB available to this mobo: 2x USB2, 6x USB3 (two on front chassis), 4x USB3.1 (two suspended in expansion slot). The expansion slot USB 3.1 interface through the SATA and SATAe ports, which I'm only using one of anyway.
My primary headache so far is related to the ASRock UEFI: There are two ways to load an XMP Profile. One of the ways simply doesn't work and the RAM always gets set back to 2133MHz (using the "Load XMP Profile"). The other way seems to work fine (Using the "DRAM Tweaker" to individually apply all of the parameters of the XMP Profile). It appears to be a bug in the UEFI 2.00. I've let ASRock know, so hopefully they address this issue. I'm not sure if this is true, but I seemed to need to re-load UEFI defaults after "Loading the XMP Profile" to get things working through the "DRAM Tweaker". It was a pain, but now everything seems good. Also, setting the DRAM Frequency doesn't seem to actually change it half the time, even though it correctly saves the settings. Something's really messed up here, but reloading UEFI defaults and then applying XMP Profile through DRAM Tweaker seems to work consistently.
On the up side, it was pretty cool that I was able to internet-update the UEFI without even having an OS! This is my first build in about 7 years, so UEFI is all new to me. Pretty nuts.