I essentially ignored everyone's cable suggestions and got a dual 3-pin XLR Silver Dragon for the convenient form factor and the fact that I've had nothing but positive experiences buying from Moon Audio.
So yeah, now that I can listen to WA22 -> LCD-3 without having to take the amp apart, I'm enjoying it a lot! Everything's fuller than the previous LCD-3 combos I had access too, but it's by no means slow, veiled, or anything else of the sort; this fullness seems pretty evenly distributed across the spectrum. I guess the Liquid Fire's the big new thing now, but I personally think this combo is great.
I don't know if anyone in this thread saw my impromptu TH900 video, but if you did, disregard what I said about these being uncomfortable. I'm actually finding them to be quite the opposite now after playing with headband adjustments more. Their weight's evident when I lay back, but otherwise they feel just fine.
-Edit-
Soundstaging compared to other headpones I've been using:
Width - HD800 > LCD-3 >> TH900
Depth - HD800 >(=?) LCD-3 >TH900
Coherence (my blend of placement and separation) - TH900 > LCD-3 > HD800, if only for the fact that, to my ears, the HD800's channels don't blend as well, also harshness.
(I've never been good at discerning height in headphones. Typically, if I can, it's for all the wrong reasons.)
^ Those are obviously early impressions with the new amp, but I think it's safe to say these image decently. People don't think otherwise on account of the LCD-2's reputation here, do they? I think the 3's added transient response really help here.