I kind of understand the setup you are going for, but to be kind of blunt (and I mean that because I really want to help you!) I just think you don’t really understand what you really need at this point. There are some pretty easy upgrades to your system, therefore I would strongly urge you to just start fresh and ask questions.
Example: Your DAC (35) + High pass (30) + splitter (7) + bass knob (20) is equal to the cost of a mini DSP, which can do all that, plus much more. And better. Room correction is going to be a huge (the biggest?) factor if you really care about bass.
There is a lot of expertise on this place and you could get better gear, for less money, including your personal wishes (no shame in being a bass head, bass is great, I got 8 10" in my living room 
)
Honestly, all you need to do is buy a mini DSP, active speakers and put the rest of your budget in your sub. KPH30i has a very acceptable inline mic too, so you can skip the external mic. Reducing the number of items on your list from 15 to 8 or so would already give you substantial upgrade.
Now I am not sure if you want any advice. I can understand theory crafting a setup is part of the fun. Just take some input