Forget measurements. Forget the cost.
What is your definition of neutral and uncolored? How would you possible know that you heard it? What is your reference point that would help you determine that?
How do you know that you just heard a dac that colored the sound or didn’t color it when you literally have every single element starting from power, outlet, cables, source, I can go on and on here, impacting the overall presentation. Unless you can answer these questions and eliminate all of the change factors from the equation, there’s no way to get to the answer. No one could possibly answer this for you.
Don’t burden yourself with getting to ultimate neutrality of components. When you build a system that gives you goosebumps when you sit down to listen, that is a far bigger achievement than soliciting thoughts from others on whats the most neutral DAC. Who cares.