Many thanks for the replies. Still mulling over trying one of the Snow-Lotus varieties since they're about the same on Amazon Prime as AliExpress, but regardless, leaning towards ordering a sampler of sorts from AE with some combination of the below:
FAAEAL Iris 1.0
Fengru EMX500
NICEHCK Vido
Philips SHE3800
QuianYun Quian25
RYGMR RY4S UE
TY Hi-Z TY
Can someone link to what is commonly referred to as the FENGRU SILVERS? That's the one I saw repeatedly in this thread but couldn't find on AE. I'd probably add those or swap one of the above out to make room for it, if they're still available.
The entire list above comes out under $40 shipped, which I hope is easily worth it to narrow down signatures before moving up... and if I'm lucky, maybe even finding one I like enough to settle on and just stock up on 4 more pairs for practically nothing. There are a few options in that $12-20 range like NICECHK EB2, NICECHK ME80, and Fengru PK2 I haven't ruled out throwing into the order, but not sure it's worth doing a hapless "buffet" in that price range until I at least check out the truly cheap options first.
To answer an earlier question: I am using the included foam on both the Datura X and H180, even though I've always preferred my MX365s naked. I quickly saw the benefits of slapping on the pads for a brighter bud.