Hi there,
To be perfectly honest, I think the poll is kind of pointless. No offence here, but given the fact that we all cannot be like average_joe to build up such a huge amount of CIEMs for comparison, at this point I'd say we are just telling you what we want/like personally. And given the usual YMMV, huge chance that it might not do the trick for you. Essentially, aside from sound quality, it boils down to less noticeable but equally important other factors such as comfort, build quality, longevity, customer services...etc. And let's face it: spending 1/6 of that 2000 bucks on a good portable amp will bring substantial gains in sound quality that might not even be realised by splurging on a much more "superior" pair of customs than what you're planning to get. After all, do you have the equipments it takes to appreciate the superiority in sound quality? $100 on a portable amp at this level sounds like a joke to me. No offence.
And if I have to chime in my opinion, I'd say that the Heir Audio 8.A with the 25% discount sounds hard to miss with all the customisation options, even though here in the UK I'd rather pick the ACS T1 Live! due to Boots 15% offer and the fact that I have to deal with overseas customs import/duty. The 8.A sounds more to your liking the most out of the three, and given the fact that you'll have around $300 to spare on an amp (or if possible, I suggest some one-in-all solutions like the DX100 or C4 DAP), it's hard to imagine you not emerging a winner.